build(web): add project-local Playwright tooling

- build: pin Playwright Test and MCP with repository-local npm, browser, and artifact paths plus sandboxed headless Chromium configuration.
- test: add a browser smoke test for the login page while keeping Playwright isolated from Vitest.
- docs: document Debian dependency setup, dual Chromium revisions, E2E commands, and project-scoped Codex MCP usage.

.codex/config.toml

@@ -0,0 +1,22 @@
+[mcp_servers.playwright]
+command = "mise"
+args = [
+  "exec",
+  "--",
+  "node",
+  "node_modules/@playwright/mcp/cli.js",
+  "--headless",
+  "--browser",
+  "chromium",
+  "--sandbox",
+  "--isolated",
+  "--output-dir",
+  "../.artifacts/playwright-mcp",
+  "--output-max-size",
+  "104857600",
+]
+cwd = "web"
+enabled = true
+required = false
+startup_timeout_sec = 30
+tool_timeout_sec = 120

.gitignore

@@ -34,6 +34,10 @@ go.work.sum
 # Mise
 mise.local.toml
 
+# Project-local development caches and browser artifacts
+/.cache/
+/.artifacts/
+
 # MyGO configuration
 # Tracking config.example.yaml in version control
 config.yaml

README.md

@@ -2,7 +2,8 @@
 
 MyGO is a WebDisk (cloud drive) server, written in Go.
 
-**Current status**: pre-alpha — project skeleton with no core functionality implemented yet.
+**Current status**: pre-alpha — basic JWT authentication and file transfer flows
+are available while their APIs and large-file behavior continue to evolve.
 
 ---
 
@@ -11,8 +12,8 @@ MyGO is a WebDisk (cloud drive) server, written in Go.
 ### v0
 
 - [ ] CLI configuration management (`mygo config`)
-- [ ] User authentication (JWT)
+- [x] User authentication (JWT)
-- [ ] File upload / download / management (HTTP API)
+- [x] Basic file upload / download / management (HTTP API)
 - [ ] Admin endpoints
 - [ ] WebDAV support
 
@@ -39,7 +40,9 @@ MyGO is a WebDisk (cloud drive) server, written in Go.
 
 ## Frontend
 
-The frontend uses React + TypeScript and communicates with the backend via HTTP API. Frontend source is maintained in `web/`.
+The frontend uses React + TypeScript and communicates with the backend via HTTP
+API. Its first milestone supports login, a root file list, single-file upload,
+and authenticated download. Frontend source is maintained in `web/`.
 
 ---
 

docs/server/roadmap.md

@@ -27,7 +27,7 @@ Package-level implementation order (each task includes unit tests):
 10. `internal/handler` — auth, account, file, admin handlers 🛠 (HTTP DTO mapping in place)
 11. `internal/server` — Gin router, route registration, graceful shutdown ✅
 12. `cmd/serve.go`, `cmd/config.go`, `cmd/status.go` ✅ (serve done)
-13. Integration tests
+13. Integration tests 🛠 (authenticated register → login → upload → list → download route flow covered with a small file)
 14. Architecture boundary tests ✅
 
 ## Future

docs/web/decisions.md

@@ -17,3 +17,55 @@
 - The Web and future native clients consume the same client-neutral API contracts.
 - MyGO or a reverse proxy may host `web/dist` with an SPA fallback without changing the rendering model.
 - MyGO domain components own file-browser behavior and must not depend on Ant Design request behavior for business logic.
+
+## 2026-07-14: Browser Authentication and Root File Workflow
+
+**Context**: The first Web milestone needs to exercise the existing login, file
+list, upload, and download APIs without committing to the later directory,
+account, admin, or large-transfer designs.
+
+**Decisions**:
+
+| Area | Choice | Guidance |
+|------|--------|----------|
+| API topology | Same-origin `/api/v1` | Vite proxies `/api` to the local Go server. Production uses a same-origin reverse proxy; the milestone does not add CORS or Go static hosting. |
+| Browser session | Token pair in `sessionStorage` | Reloading the tab preserves the session, while closing the tab clears it. Do not add persistent login until the token transport design is revisited. |
+| Token refresh | Refresh once after a protected request returns 401 | Share one in-flight refresh across concurrent failures, store the rotated pair, and retry each request once. Clear the session if refresh or the retry fails. |
+| File scope | Root directory only | List root entries, upload one file to root, and download files. Show directories as non-interactive rows. |
+| Transfer model | Browser `FormData` upload and authenticated Blob download | This is intentionally limited to the small-file milestone; progress, streaming-to-disk, chunking, resume, and queues remain deferred. |
+
+**Consequences**:
+- The API client owns bearer headers, error parsing, refresh coordination, and
+  session invalidation; pages consume operation-specific functions.
+- TanStack Query caches are cleared whenever an authenticated session ends so
+  one user cannot see another user's cached file metadata.
+- The file picker is independent of Ant Design upload request behavior, keeping
+  transfer policy in MyGO code.
+- Handwritten TypeScript wire types remain temporary until an OpenAPI contract
+  is available.
+
+## 2026-07-14: Project-local Headless Browser Tooling
+
+**Context**: Browser behavior needs deterministic E2E coverage and interactive
+agent debugging inside a long-lived headless Debian Incus container. Tooling
+should remain reproducible without placing browser binaries or generated
+artifacts in a developer's home directory.
+
+**Decisions**:
+
+| Area | Choice | Guidance |
+|------|--------|----------|
+| Regression tests | Playwright Test with bundled Chromium | Keep browser E2E tests separate from `npm run check` because browser installation is an explicit environment setup step. |
+| Agent debugging | Official Playwright MCP over project-scoped STDIO | Codex starts the locked local package from `.codex/config.toml`; do not use a global install, an `@latest` npx invocation, or a listening MCP service. |
+| Browser state | Headless, isolated, and sandboxed | Use bundled Chromium, discard the MCP profile after each session, and retain the Chromium sandbox supported by the Incus environment. |
+| Local resources | Repository `.cache/` and `.artifacts/` directories | `mise.toml` defines the portable npm and browser cache paths. Generated resources remain ignored by Git. |
+| Browser versions | Install both locked Playwright revisions | The stable test runner and current MCP package require different Chromium revisions; do not force either package onto an unsupported executable. |
+
+**Consequences**:
+- Debian browser libraries are installed once in the Incus container root
+  filesystem; npm packages, browsers, traces, screenshots, and MCP output stay
+  project-scoped.
+- A fresh environment runs `npm ci`, the system dependency installer, and both
+  browser install scripts before browser tests or MCP debugging.
+- Browser failures can retain traces, screenshots, and video under
+  `.artifacts/playwright/` without adding generated files to source control.

docs/web/roadmap.md

@@ -8,9 +8,23 @@
 - Production may serve `web/dist` from MyGO or a reverse proxy.
 - Shared API contracts should remain client-neutral and eventually be described by OpenAPI.
 
+## Current Milestone
+
+The browser client now provides the first authenticated file workflow:
+
+- Email/password login through the shared REST API
+- Session-scoped access and refresh tokens with one automatic refresh retry
+- Protected application shell and root file list
+- Single-file upload to the root directory and authenticated download
+- Server-side pagination with 50 items per page
+
+Directory navigation and management, multi-file queues, transfer progress,
+resumable or chunked transfers, account/profile/settings screens, and admin
+screens remain deferred.
+
 ## Foundation
 
-The initial project contains only the framework and styling foundation:
+The project foundation contains:
 
 - Node.js 24 and npm
 - Vite
@@ -19,7 +33,11 @@ The initial project contains only the framework and styling foundation:
 - TanStack Query provider
 - Tailwind CSS 4 through its Vite plugin
 - Ant Design provider and components
+- Ant Design icons for application and file actions
 - Oxlint from the Vite template
+- Vitest for framework-independent client and session tests
+- Playwright Test with a headless Chromium smoke test
+- Project-scoped Playwright MCP for interactive browser debugging
 
 Ant Design owns reusable UI components and theme tokens. Tailwind CSS is initially limited to application layout, spacing, and responsive utilities.
 
@@ -40,10 +58,8 @@ web/src/
 
 Some dependencies are suggested for future implementation. Refer these only when the corresponding feature is implemented and propose better choices if any:
 
-- `@ant-design/icons`: Add Ant Design-consistent application and action icons when real screens require them.
 - `openapi-typescript`: Generate TypeScript API types from the shared OpenAPI document.
 - `openapi-fetch`: Provide a small type-safe Fetch client based on generated OpenAPI types.
 - `openapi-react-query`: Connect generated OpenAPI operations to TanStack Query if handwritten query adapters become repetitive.
 - `zustand`: Manage a cross-route upload queue, bulk selection, or other complex client-only state if React state is insufficient.
-- `vitest`: Run unit and integration tests using the Vite toolchain.
 - `pdfjs-dist`: Preview PDF files in the browser when document preview is implemented.

internal/server/server_test.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"io"
+	"mime/multipart"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -14,6 +16,7 @@ import (
 	"github.com/dhao2001/mygo/internal/config"
 	"github.com/dhao2001/mygo/internal/repository"
 	"github.com/dhao2001/mygo/internal/service"
+	"github.com/dhao2001/mygo/internal/storage"
 )
 
 func TestVersionRoute(t *testing.T) {
@@ -181,3 +184,192 @@ func TestAdminRoutes(t *testing.T) {
 		t.Errorf("no-auth delete: status=%d, want %d, body=%s", rec.Code, http.StatusUnauthorized, rec.Body.String())
 	}
 }
+
+func TestAuthenticatedFileFlow(t *testing.T) {
+	dbCfg := config.DatabaseConfig{
+		Driver: "sqlite3",
+		SQLite: config.SQLiteConfig{Path: ":memory:"},
+	}
+	db, err := repository.Open(dbCfg)
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	if err := repository.AutoMigrate(db); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+
+	userRepo := repository.NewUserRepository(db)
+	sessionRepo := repository.NewSessionRepository(db)
+	fileRepo := repository.NewFileRepository(db)
+	credentialRepo := repository.NewCredentialRepository(db)
+	store, err := storage.NewLocalStorage(t.TempDir())
+	if err != nil {
+		t.Fatalf("create local storage: %v", err)
+	}
+
+	const maxUploadSize = 20 << 20
+	jwtSecret := []byte("test-secret")
+	authService := service.NewAuthService(
+		userRepo,
+		sessionRepo,
+		credentialRepo,
+		jwtSecret,
+		15*time.Minute,
+		168*time.Hour,
+	)
+	fileService := service.NewFileService(fileRepo, store, maxUploadSize, nil)
+	cfg := &config.Config{
+		JWT: config.JWTConfig{
+			Secret:     string(jwtSecret),
+			AccessTTL:  15 * time.Minute,
+			RefreshTTL: 168 * time.Hour,
+		},
+		Storage: config.StorageConfig{MaxUploadSize: maxUploadSize},
+	}
+	webApp := app.NewWebApp(
+		cfg,
+		db,
+		userRepo,
+		sessionRepo,
+		fileRepo,
+		credentialRepo,
+		authService,
+		service.NewAdminService(userRepo),
+		fileService,
+		store,
+	)
+	t.Cleanup(func() {
+		if err := webApp.Close(); err != nil {
+			t.Errorf("close web app: %v", err)
+		}
+	})
+	router := NewRouter(webApp)
+
+	registerBody := []byte(`{"username":"web-user","email":"web@example.com","password":"password123"}`)
+	registerRequest := httptest.NewRequest(
+		http.MethodPost,
+		"/api/v1/auth/register",
+		bytes.NewReader(registerBody),
+	)
+	registerRequest.Header.Set("Content-Type", "application/json")
+	registerResponse := httptest.NewRecorder()
+	router.ServeHTTP(registerResponse, registerRequest)
+	if registerResponse.Code != http.StatusCreated {
+		t.Fatalf("register: status=%d, body=%s", registerResponse.Code, registerResponse.Body.String())
+	}
+
+	loginBody := []byte(`{"email":"web@example.com","password":"password123"}`)
+	loginRequest := httptest.NewRequest(
+		http.MethodPost,
+		"/api/v1/auth/login",
+		bytes.NewReader(loginBody),
+	)
+	loginRequest.Header.Set("Content-Type", "application/json")
+	loginResponse := httptest.NewRecorder()
+	router.ServeHTTP(loginResponse, loginRequest)
+	if loginResponse.Code != http.StatusOK {
+		t.Fatalf("login: status=%d, body=%s", loginResponse.Code, loginResponse.Body.String())
+	}
+	var tokens struct {
+		AccessToken string `json:"access_token"`
+	}
+	if err := json.Unmarshal(loginResponse.Body.Bytes(), &tokens); err != nil {
+		t.Fatalf("decode login response: %v", err)
+	}
+	if tokens.AccessToken == "" {
+		t.Fatal("login response has empty access token")
+	}
+
+	listRequest := httptest.NewRequest(http.MethodGet, "/api/v1/files?offset=0&limit=50", nil)
+	listRequest.Header.Set("Authorization", "Bearer "+tokens.AccessToken)
+	listResponse := httptest.NewRecorder()
+	router.ServeHTTP(listResponse, listRequest)
+	if listResponse.Code != http.StatusOK {
+		t.Fatalf("initial list: status=%d, body=%s", listResponse.Code, listResponse.Body.String())
+	}
+	var initialList struct {
+		Total int64 `json:"total"`
+	}
+	if err := json.Unmarshal(listResponse.Body.Bytes(), &initialList); err != nil {
+		t.Fatalf("decode initial list: %v", err)
+	}
+	if initialList.Total != 0 {
+		t.Fatalf("initial total=%d, want 0", initialList.Total)
+	}
+
+	fileContent := []byte("MyGO browser milestone upload")
+	uploadBody := &bytes.Buffer{}
+	multipartWriter := multipart.NewWriter(uploadBody)
+	filePart, err := multipartWriter.CreateFormFile("file", "milestone.txt")
+	if err != nil {
+		t.Fatalf("create multipart file: %v", err)
+	}
+	if _, err := filePart.Write(fileContent); err != nil {
+		t.Fatalf("write multipart file: %v", err)
+	}
+	if err := multipartWriter.Close(); err != nil {
+		t.Fatalf("close multipart writer: %v", err)
+	}
+	uploadRequest := httptest.NewRequest(http.MethodPost, "/api/v1/files", uploadBody)
+	uploadRequest.Header.Set("Authorization", "Bearer "+tokens.AccessToken)
+	uploadRequest.Header.Set("Content-Type", multipartWriter.FormDataContentType())
+	uploadResponse := httptest.NewRecorder()
+	router.ServeHTTP(uploadResponse, uploadRequest)
+	if uploadResponse.Code != http.StatusCreated {
+		t.Fatalf("upload: status=%d, body=%s", uploadResponse.Code, uploadResponse.Body.String())
+	}
+	var uploadedFile struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+		Size int64  `json:"size"`
+	}
+	if err := json.Unmarshal(uploadResponse.Body.Bytes(), &uploadedFile); err != nil {
+		t.Fatalf("decode upload response: %v", err)
+	}
+	if uploadedFile.Name != "milestone.txt" || uploadedFile.Size != int64(len(fileContent)) {
+		t.Fatalf("uploaded file=%+v, want name milestone.txt and size %d", uploadedFile, len(fileContent))
+	}
+
+	listRequest = httptest.NewRequest(http.MethodGet, "/api/v1/files?offset=0&limit=50", nil)
+	listRequest.Header.Set("Authorization", "Bearer "+tokens.AccessToken)
+	listResponse = httptest.NewRecorder()
+	router.ServeHTTP(listResponse, listRequest)
+	if listResponse.Code != http.StatusOK {
+		t.Fatalf("list after upload: status=%d, body=%s", listResponse.Code, listResponse.Body.String())
+	}
+	var uploadedList struct {
+		Files []struct {
+			ID   string `json:"id"`
+			Name string `json:"name"`
+		} `json:"files"`
+		Total int64 `json:"total"`
+	}
+	if err := json.Unmarshal(listResponse.Body.Bytes(), &uploadedList); err != nil {
+		t.Fatalf("decode uploaded list: %v", err)
+	}
+	if uploadedList.Total != 1 || len(uploadedList.Files) != 1 || uploadedList.Files[0].ID != uploadedFile.ID {
+		t.Fatalf("uploaded list=%+v, want the uploaded file", uploadedList)
+	}
+
+	downloadRequest := httptest.NewRequest(
+		http.MethodGet,
+		"/api/v1/files/"+uploadedFile.ID+"/content",
+		nil,
+	)
+	downloadRequest.Header.Set("Authorization", "Bearer "+tokens.AccessToken)
+	downloadResponse := httptest.NewRecorder()
+	router.ServeHTTP(downloadResponse, downloadRequest)
+	if downloadResponse.Code != http.StatusOK {
+		t.Fatalf("download: status=%d, body=%s", downloadResponse.Code, downloadResponse.Body.String())
+	}
+	downloadedContent, err := io.ReadAll(downloadResponse.Body)
+	if err != nil {
+		t.Fatalf("read download response: %v", err)
+	}
+	if !bytes.Equal(downloadedContent, fileContent) {
+		t.Fatalf("downloaded content=%q, want %q", downloadedContent, fileContent)
+	}
+	if disposition := downloadResponse.Header().Get("Content-Disposition"); disposition == "" {
+		t.Fatal("download response has empty Content-Disposition")
+	}
+}

mise.toml

@@ -1,3 +1,7 @@
 [tools]
 go = "1.26.2"
 node = "24"
+
+[env]
+NPM_CONFIG_CACHE = "{{config_root}}/.cache/npm"
+PLAYWRIGHT_BROWSERS_PATH = "{{config_root}}/.cache/ms-playwright"

web/README.md

@@ -4,15 +4,80 @@ MyGO's browser client is a pure client-side rendered application built with Reac
 
 ## Development
 
+Install the repository-pinned Go and Node.js versions from the repository
+root:
+
 ```bash
-npm install
+mise install
-npm run dev
 ```
 
+Start the Go API from the repository root:
+
+```bash
+mise exec -- go run . serve
+```
+
+Create a development account through the existing public API if needed:
+
+```bash
+curl --request POST http://127.0.0.1:10086/api/v1/auth/register \
+  --header 'Content-Type: application/json' \
+  --data '{"username":"web-user","email":"web@example.com","password":"password123"}'
+```
+
+Then start the browser client from `web/`:
+
+```bash
+mise exec -- npm ci
+mise exec -- npm run dev
+```
+
+Vite proxies `/api` to `http://127.0.0.1:10086`. Production deployments must
+serve the static build and `/api/v1` from the same origin, normally through a
+reverse proxy.
+
+## Browser Testing and Debugging
+
+The repository uses Playwright Test for repeatable browser tests and the
+official Playwright MCP server for interactive browser debugging. Mise keeps
+the npm cache and Playwright browser binaries under the repository-level
+`.cache/` directory.
+
+Install the Debian browser dependencies once per development container:
+
+```bash
+mise exec -- npm run playwright:install:deps
+```
+
+Install the Chromium revisions used by Playwright Test and Playwright MCP:
+
+```bash
+mise exec -- npm run playwright:install
+mise exec -- npm run playwright:install:mcp
+```
+
+The two commands are intentionally separate because the locked stable test
+runner and MCP package currently depend on different Playwright revisions.
+Both revisions are stored in `.cache/ms-playwright/` and are ignored by Git.
+
+Run the headless browser tests with Chromium sandboxing enabled:
+
+```bash
+mise exec -- npm run test:e2e
+```
+
+Codex loads the project-scoped Playwright MCP server from
+`.codex/config.toml` after the repository is trusted and Codex is restarted.
+The MCP browser uses bundled Chromium in headless, isolated, sandboxed mode;
+its generated files are kept under `.artifacts/playwright-mcp/`.
+
 ## Checks
 
 ```bash
-npm run check
+mise exec -- npm run check
 ```
 
-The production build is emitted to `dist/` as static assets. See `docs/web/roadmap.md` at the repository root for architecture boundaries and planned dependencies.
+The production build is emitted to `dist/` as static assets. Browser E2E tests
+are run separately because they require the browser setup above. See
+`docs/web/roadmap.md` at the repository root for architecture boundaries and
+planned dependencies.

web/e2e/login-page.spec.ts

@@ -0,0 +1,11 @@
+import { expect, test } from '@playwright/test'
+
+test('renders the login page in a real browser', async ({ page }) => {
+  const response = await page.goto('/login')
+
+  expect(response?.ok()).toBe(true)
+  await expect(page.getByRole('heading', { name: 'Sign in to MyGO' })).toBeVisible()
+  await expect(page.getByLabel('Email')).toBeVisible()
+  await expect(page.getByLabel('Password')).toBeVisible()
+  await expect(page.getByRole('button', { name: 'Sign in' })).toBeVisible()
+})

web/package-lock.json

@@ -8,6 +8,7 @@
       "name": "mygo-web",
       "version": "0.0.0",
       "dependencies": {
+        "@ant-design/icons": "^6.3.2",
         "@tanstack/react-query": "^5.101.2",
         "antd": "^6.5.1",
         "react": "^19.2.7",
@@ -15,6 +16,8 @@
         "react-router": "^8.2.0"
       },
       "devDependencies": {
+        "@playwright/mcp": "0.0.78",
+        "@playwright/test": "1.61.1",
         "@tailwindcss/vite": "^4.3.2",
         "@types/node": "^24.13.2",
         "@types/react": "^19.2.17",
@@ -23,7 +26,8 @@
         "oxlint": "^1.71.0",
         "tailwindcss": "^4.3.2",
         "typescript": "~6.0.2",
-        "vite": "^8.1.1"
+        "vite": "^8.1.1",
+        "vitest": "^4.1.10"
       },
       "engines": {
         "node": ">=24 <25"
@@ -579,6 +583,86 @@
         "node": "^20.19.0 || >=22.12.0"
       }
     },
+    "node_modules/@playwright/mcp": {
+      "version": "0.0.78",
+      "resolved": "https://registry.npmmirror.com/@playwright/mcp/-/mcp-0.0.78.tgz",
+      "integrity": "sha512-XLTUeA6mEN9sQ+hJ4dfG8EIkDbxS0K3Trc2RBkUJuf02TgE2FQRNTMtq/aJfhyRMINsRl/Ybc4sxcWLtFn4/TQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.62.0-alpha-1783623505000",
+        "playwright-core": "1.62.0-alpha-1783623505000"
+      },
+      "bin": {
+        "playwright-mcp": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@playwright/test": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmmirror.com/@playwright/test/-/test-1.61.1.tgz",
+      "integrity": "sha512-8nKv6+0RJSL9FE4jYOEGXnPeM/Hg12qZpmqzZjRh3qM0Y7c3z1mrOTfFLids72RDQYVh9WpLEfR5WdpNX4fkig==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@playwright/test/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmmirror.com/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/@playwright/test/node_modules/playwright": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmmirror.com/playwright/-/playwright-1.61.1.tgz",
+      "integrity": "sha512-DWnY5o3YbLWK4GovuAVwpqL+1VwGNdUGrRr++8j8PtQQzvAVZUIMjKQ90fY689sEJZJBbZVw1rXaOKSTitkzPQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/@playwright/test/node_modules/playwright-core": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmmirror.com/playwright-core/-/playwright-core-1.61.1.tgz",
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@@ -1546,6 +1630,13 @@
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@@ -1855,6 +1946,31 @@
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@@ -1911,6 +2027,119 @@
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@@ -1974,6 +2203,26 @@
         "react-dom": ">=18.0.0"
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+      "resolved": "https://registry.npmmirror.com/assertion-error/-/assertion-error-2.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      "resolved": "https://registry.npmmirror.com/chai/-/chai-6.2.2.tgz",
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+      "dev": true,
+      "license": "MIT",
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@@ -1989,6 +2238,13 @@
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       "license": "MIT"
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+    "node_modules/convert-source-map": {
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+      "resolved": "https://registry.npmmirror.com/convert-source-map/-/convert-source-map-2.0.0.tgz",
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+      "dev": true,
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       "resolved": "https://registry.npmmirror.com/cookie-es/-/cookie-es-3.1.1.tgz",
@@ -2031,6 +2287,33 @@
         "node": ">=10.13.0"
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+      "resolved": "https://registry.npmmirror.com/es-module-lexer/-/es-module-lexer-2.3.1.tgz",
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+      "dev": true,
+      "license": "MIT"
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+      "resolved": "https://registry.npmmirror.com/estree-walker/-/estree-walker-3.0.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+    "node_modules/expect-type": {
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+      "resolved": "https://registry.npmmirror.com/expect-type/-/expect-type-1.4.0.tgz",
+      "integrity": "sha512-KfYbmpRm0VbLjEvVa9yGwCi9GI34xvi7A/HXYWQO65CSD2u3MczUJSuwXKFIxlGsgBQizV9q5J9NHj4VG0n+pA==",
+      "dev": true,
+      "license": "Apache-2.0",
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       "resolved": "https://registry.npmmirror.com/fdir/-/fdir-6.5.0.tgz",
@@ -2386,6 +2669,20 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
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+      "version": "2.1.3",
+      "resolved": "https://registry.npmmirror.com/obug/-/obug-2.1.3.tgz",
+      "integrity": "sha512-9miFgM2OFba7hB+pRgvtV84pYTBaoTHohvmIgiRt6dRIzbwEOIaNaP+dIlGs2fNFoB0SeISs0Jz5WFVRid6Xyg==",
+      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/sxzz",
+        "https://opencollective.com/debug"
+      ],
+      "license": "MIT",
+      "engines": {
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       "resolved": "https://registry.npmmirror.com/oxlint/-/oxlint-1.74.0.tgz",
@@ -2435,6 +2732,13 @@
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+      "version": "2.0.3",
+      "resolved": "https://registry.npmmirror.com/pathe/-/pathe-2.0.3.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmmirror.com/picocolors/-/picocolors-1.1.1.tgz",
@@ -2455,6 +2759,53 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/playwright": {
+      "version": "1.62.0-alpha-1783623505000",
+      "resolved": "https://registry.npmmirror.com/playwright/-/playwright-1.62.0-alpha-1783623505000.tgz",
+      "integrity": "sha512-6KV9h4PP3hqu4NaGdxxcijWfYh9LJcFI/R2sP4TTC4I5cFo3oRawN0ETlW5MkE3cQEgKhhoj0KUNz4sfpCT0Tg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.62.0-alpha-1783623505000"
+      },
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+        "playwright": "cli.js"
+      },
+      "engines": {
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+      "optionalDependencies": {
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+    "node_modules/playwright-core": {
+      "version": "1.62.0-alpha-1783623505000",
+      "resolved": "https://registry.npmmirror.com/playwright-core/-/playwright-core-1.62.0-alpha-1783623505000.tgz",
+      "integrity": "sha512-CPJZdsA/KGT2QQlekiV6Wt+QlQrZHVSZ6oiNtOI/bYYOIVLM8jfKGWTM4zQiyd4UN+40Cq4cA6lxmZHZbtPvJQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
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+      "engines": {
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+    "node_modules/playwright/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmmirror.com/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
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     "node_modules/postcss": {
       "version": "8.5.19",
       "resolved": "https://registry.npmmirror.com/postcss/-/postcss-8.5.19.tgz",
@@ -2581,6 +2932,13 @@
         "compute-scroll-into-view": "^3.0.2"
       }
     },
+    "node_modules/siginfo": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmmirror.com/siginfo/-/siginfo-2.0.0.tgz",
+      "integrity": "sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==",
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+      "license": "ISC"
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       "resolved": "https://registry.npmmirror.com/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -2591,6 +2949,20 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/stackback": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmmirror.com/stackback/-/stackback-0.0.2.tgz",
+      "integrity": "sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/std-env": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmmirror.com/std-env/-/std-env-4.2.0.tgz",
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+      "dev": true,
+      "license": "MIT"
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     "node_modules/string-convert": {
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       "resolved": "https://registry.npmmirror.com/string-convert/-/string-convert-0.2.1.tgz",
@@ -2633,6 +3005,23 @@
         "node": ">=12.22"
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+      "version": "2.9.0",
+      "resolved": "https://registry.npmmirror.com/tinybench/-/tinybench-2.9.0.tgz",
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+      "dev": true,
+      "license": "MIT"
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+    "node_modules/tinyexec": {
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+      "resolved": "https://registry.npmmirror.com/tinyexec/-/tinyexec-1.2.4.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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       "resolved": "https://registry.npmmirror.com/tinyglobby/-/tinyglobby-0.2.17.tgz",
@@ -2650,6 +3039,16 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmmirror.com/tinyrainbow/-/tinyrainbow-3.1.0.tgz",
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+      "dev": true,
+      "license": "MIT",
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       "resolved": "https://registry.npmmirror.com/tslib/-/tslib-2.8.1.tgz",
@@ -2756,6 +3155,113 @@
           "optional": true
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+      "resolved": "https://registry.npmmirror.com/vitest/-/vitest-4.1.10.tgz",
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+      "dev": true,
+      "license": "MIT",
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+        "@vitest/mocker": "4.1.10",
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+        "@vitest/snapshot": "4.1.10",
+        "@vitest/spy": "4.1.10",
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+        "why-is-node-running": "^2.3.0"
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+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.10",
+        "@vitest/browser-preview": "4.1.10",
+        "@vitest/browser-webdriverio": "4.1.10",
+        "@vitest/coverage-istanbul": "4.1.10",
+        "@vitest/coverage-v8": "4.1.10",
+        "@vitest/ui": "4.1.10",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmmirror.com/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
     }
   }
 }

web/package.json

@@ -11,11 +11,17 @@
     "dev": "vite",
     "build": "tsc -b && vite build",
     "lint": "oxlint",
+    "playwright:install": "playwright install chromium",
+    "playwright:install:deps": "playwright install-deps chromium",
+    "playwright:install:mcp": "node node_modules/playwright/cli.js install chromium",
+    "test": "vitest run",
+    "test:e2e": "playwright test",
     "typecheck": "tsc -b",
-    "check": "npm run lint && npm run build",
+    "check": "npm run lint && npm run test && npm run build",
     "preview": "vite preview"
   },
   "dependencies": {
+    "@ant-design/icons": "^6.3.2",
     "@tanstack/react-query": "^5.101.2",
     "antd": "^6.5.1",
     "react": "^19.2.7",
@@ -23,6 +29,8 @@
     "react-router": "^8.2.0"
   },
   "devDependencies": {
+    "@playwright/mcp": "0.0.78",
+    "@playwright/test": "1.61.1",
     "@tailwindcss/vite": "^4.3.2",
     "@types/node": "^24.13.2",
     "@types/react": "^19.2.17",
@@ -31,6 +39,7 @@
     "oxlint": "^1.71.0",
     "tailwindcss": "^4.3.2",
     "typescript": "~6.0.2",
-    "vite": "^8.1.1"
+    "vite": "^8.1.1",
+    "vitest": "^4.1.10"
   }
 }

web/playwright.config.ts

@@ -0,0 +1,44 @@
+import { defineConfig, devices } from '@playwright/test'
+import { fileURLToPath } from 'node:url'
+
+const repositoryRoot = fileURLToPath(new URL('..', import.meta.url))
+
+export default defineConfig({
+  testDir: './e2e',
+  outputDir: `${repositoryRoot}/.artifacts/playwright/test-results`,
+  fullyParallel: true,
+  forbidOnly: Boolean(process.env.CI),
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: [
+    ['list'],
+    [
+      'html',
+      {
+        open: 'never',
+        outputFolder: `${repositoryRoot}/.artifacts/playwright/report`,
+      },
+    ],
+  ],
+  use: {
+    baseURL: 'http://127.0.0.1:5173',
+    launchOptions: {
+      chromiumSandbox: true,
+    },
+    screenshot: 'only-on-failure',
+    trace: 'retain-on-failure',
+    video: 'retain-on-failure',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+  webServer: {
+    command: 'npm run dev -- --host 127.0.0.1',
+    url: 'http://127.0.0.1:5173/login',
+    reuseExistingServer: !process.env.CI,
+    timeout: 120_000,
+  },
+})

web/src/api/auth.ts

@@ -0,0 +1,19 @@
+import { apiClient } from './client.ts'
+import type { TokenPair } from './types.ts'
+
+export function login(email: string, password: string) {
+  return apiClient.request<TokenPair>('/auth/login', {
+    auth: false,
+    method: 'POST',
+    json: { email, password },
+  })
+}
+
+export function logout(refreshToken: string) {
+  return apiClient.request<void>('/auth/logout', {
+    auth: false,
+    method: 'POST',
+    json: { refresh_token: refreshToken },
+    responseType: 'void',
+  })
+}

web/src/api/client.test.ts

@@ -0,0 +1,127 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { createApiClient } from './client.ts'
+import { createSessionStore } from './session.ts'
+
+function jsonResponse(body: unknown, status = 200) {
+  return new Response(JSON.stringify(body), {
+    status,
+    headers: { 'Content-Type': 'application/json' },
+  })
+}
+
+describe('API client', () => {
+  it('adds the current access token to authenticated requests', async () => {
+    const store = createSessionStore()
+    store.set({ access_token: 'access-one', refresh_token: 'refresh-one' })
+    const fetchImplementation = vi.fn<typeof fetch>()
+    fetchImplementation.mockResolvedValue(jsonResponse({ ok: true }))
+    const client = createApiClient({
+      apiBase: '/test-api',
+      fetchImplementation,
+      store,
+    })
+
+    await expect(client.request('/files')).resolves.toEqual({ ok: true })
+
+    const [, options] = fetchImplementation.mock.calls[0]
+    expect(new Headers(options?.headers).get('Authorization')).toBe(
+      'Bearer access-one',
+    )
+  })
+
+  it('shares one refresh across concurrent 401 responses and retries both requests', async () => {
+    const store = createSessionStore()
+    store.set({ access_token: 'expired-access', refresh_token: 'refresh-one' })
+
+    let resolveRefresh: ((response: Response) => void) | undefined
+    const refreshResponse = new Promise<Response>((resolve) => {
+      resolveRefresh = resolve
+    })
+    const fetchImplementation = vi.fn<typeof fetch>(async (input, options) => {
+      const url = String(input)
+      if (url.endsWith('/auth/refresh')) {
+        return refreshResponse
+      }
+
+      const authorization = new Headers(options?.headers).get('Authorization')
+      if (authorization === 'Bearer expired-access') {
+        return jsonResponse({ error: { message: 'expired' } }, 401)
+      }
+      return jsonResponse({ url })
+    })
+    const client = createApiClient({ fetchImplementation, store })
+
+    const requests = Promise.all([
+      client.request('/files?offset=0'),
+      client.request('/files?offset=50'),
+    ])
+
+    await vi.waitFor(() => {
+      expect(
+        fetchImplementation.mock.calls.filter(([input]) =>
+          String(input).endsWith('/auth/refresh'),
+        ),
+      ).toHaveLength(1)
+    })
+    resolveRefresh?.(
+      jsonResponse({
+        access_token: 'access-two',
+        refresh_token: 'refresh-two',
+      }),
+    )
+
+    await expect(requests).resolves.toHaveLength(2)
+    expect(store.get()).toEqual({
+      access_token: 'access-two',
+      refresh_token: 'refresh-two',
+    })
+    expect(fetchImplementation).toHaveBeenCalledTimes(5)
+  })
+
+  it('clears the session when refresh fails', async () => {
+    const store = createSessionStore()
+    store.set({ access_token: 'expired-access', refresh_token: 'expired-refresh' })
+    const fetchImplementation = vi.fn<typeof fetch>()
+    fetchImplementation
+      .mockResolvedValueOnce(jsonResponse({ error: { message: 'expired' } }, 401))
+      .mockResolvedValueOnce(
+        jsonResponse(
+          { error: { message: 'invalid token', log_id: 'log-123' } },
+          401,
+        ),
+      )
+    const client = createApiClient({ fetchImplementation, store })
+
+    const request = client.request('/files')
+
+    await expect(request).rejects.toMatchObject({
+      status: 401,
+      message: 'invalid token',
+      logId: 'log-123',
+    })
+    expect(store.get()).toBeNull()
+  })
+
+  it('clears the session when the retried request is still unauthorized', async () => {
+    const store = createSessionStore()
+    store.set({ access_token: 'expired-access', refresh_token: 'refresh-one' })
+    const fetchImplementation = vi.fn<typeof fetch>()
+    fetchImplementation
+      .mockResolvedValueOnce(jsonResponse({ error: { message: 'expired' } }, 401))
+      .mockResolvedValueOnce(
+        jsonResponse({
+          access_token: 'access-two',
+          refresh_token: 'refresh-two',
+        }),
+      )
+      .mockResolvedValueOnce(jsonResponse({ error: { message: 'denied' } }, 401))
+    const client = createApiClient({ fetchImplementation, store })
+
+    await expect(client.request('/files')).rejects.toMatchObject({
+      status: 401,
+      message: 'denied',
+    })
+    expect(store.get()).toBeNull()
+  })
+})

web/src/api/client.ts

@@ -0,0 +1,159 @@
+import { sessionStore, type SessionStore } from './session.ts'
+import type { ErrorResponse, TokenPair } from './types.ts'
+
+const defaultApiBase = '/api/v1'
+
+type ResponseType = 'blob' | 'json' | 'void'
+
+export interface ApiRequestOptions {
+  auth?: boolean
+  body?: BodyInit | null
+  headers?: HeadersInit
+  json?: unknown
+  method?: string
+  responseType?: ResponseType
+  signal?: AbortSignal
+}
+
+interface ApiClientOptions {
+  apiBase?: string
+  fetchImplementation?: typeof fetch
+  store?: SessionStore
+}
+
+export class ApiError extends Error {
+  readonly status: number
+  readonly logId?: string
+
+  constructor(status: number, message: string, logId?: string) {
+    super(message)
+    this.name = 'ApiError'
+    this.status = status
+    this.logId = logId
+  }
+}
+
+async function responseError(response: Response): Promise<ApiError> {
+  let body: ErrorResponse | undefined
+  try {
+    body = (await response.json()) as ErrorResponse
+  } catch {
+    // Non-JSON failures use a stable fallback message.
+  }
+
+  const message =
+    body?.error?.message ?? `Request failed with status ${response.status}`
+  return new ApiError(response.status, message, body?.error?.log_id)
+}
+
+async function readResponse<T>(
+  response: Response,
+  responseType: ResponseType,
+): Promise<T> {
+  if (!response.ok) {
+    throw await responseError(response)
+  }
+
+  if (responseType === 'blob') {
+    return (await response.blob()) as T
+  }
+  if (responseType === 'void' || response.status === 204) {
+    return undefined as T
+  }
+  return (await response.json()) as T
+}
+
+export function createApiClient({
+  apiBase = defaultApiBase,
+  fetchImplementation = fetch,
+  store = sessionStore,
+}: ApiClientOptions = {}) {
+  let refreshPromise: Promise<TokenPair> | null = null
+
+  const refreshSession = (): Promise<TokenPair> => {
+    if (refreshPromise) {
+      return refreshPromise
+    }
+
+    const refreshToken = store.get()?.refresh_token
+    if (!refreshToken) {
+      store.clear()
+      return Promise.reject(new ApiError(401, 'Your session has expired'))
+    }
+
+    refreshPromise = fetchImplementation(`${apiBase}/auth/refresh`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ refresh_token: refreshToken }),
+    })
+      .then((response) => readResponse<TokenPair>(response, 'json'))
+      .then((session) => {
+        store.set(session)
+        return session
+      })
+      .catch((error: unknown) => {
+        store.clear()
+        throw error
+      })
+      .finally(() => {
+        refreshPromise = null
+      })
+
+    return refreshPromise
+  }
+
+  const request = async <T>(
+    path: string,
+    options: ApiRequestOptions = {},
+  ): Promise<T> => {
+    const {
+      auth = true,
+      body,
+      headers: providedHeaders,
+      json,
+      method = 'GET',
+      responseType = 'json',
+      signal,
+    } = options
+
+    const run = (accessToken?: string) => {
+      const headers = new Headers(providedHeaders)
+      let requestBody = body
+
+      if (json !== undefined) {
+        headers.set('Content-Type', 'application/json')
+        requestBody = JSON.stringify(json)
+      }
+      if (accessToken) {
+        headers.set('Authorization', `Bearer ${accessToken}`)
+      }
+
+      return fetchImplementation(`${apiBase}${path}`, {
+        method,
+        headers,
+        body: requestBody,
+        signal,
+      })
+    }
+
+    const accessToken = auth ? store.get()?.access_token : undefined
+    if (auth && !accessToken) {
+      throw new ApiError(401, 'Authentication required')
+    }
+
+    let response = await run(accessToken)
+    if (auth && response.status === 401) {
+      const refreshedSession = await refreshSession()
+      response = await run(refreshedSession.access_token)
+      if (response.status === 401) {
+        store.clear()
+      }
+    }
+
+    return readResponse<T>(response, responseType)
+  }
+
+  return { request }
+}
+
+export const apiClient = createApiClient()

web/src/api/files.ts

@@ -0,0 +1,27 @@
+import { apiClient } from './client.ts'
+import type { FileInfo, FileListResponse } from './types.ts'
+
+export function listRootFiles(offset: number, limit: number, signal?: AbortSignal) {
+  const params = new URLSearchParams({
+    offset: String(offset),
+    limit: String(limit),
+  })
+  return apiClient.request<FileListResponse>(`/files?${params}`, { signal })
+}
+
+export function uploadRootFile(file: File) {
+  const body = new FormData()
+  body.append('file', file)
+
+  return apiClient.request<FileInfo>('/files', {
+    method: 'POST',
+    body,
+  })
+}
+
+export function downloadFile(fileID: string) {
+  return apiClient.request<Blob>(
+    `/files/${encodeURIComponent(fileID)}/content`,
+    { responseType: 'blob' },
+  )
+}

web/src/api/session.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it, vi } from 'vitest'
+
+import { createSessionStore } from './session.ts'
+import type { TokenPair } from './types.ts'
+
+class MemoryStorage {
+  private readonly values = new Map<string, string>()
+
+  getItem(key: string) {
+    return this.values.get(key) ?? null
+  }
+
+  removeItem(key: string) {
+    this.values.delete(key)
+  }
+
+  setItem(key: string, value: string) {
+    this.values.set(key, value)
+  }
+}
+
+const session: TokenPair = {
+  access_token: 'access-token',
+  refresh_token: 'refresh-token',
+}
+
+describe('session store', () => {
+  it('persists and reloads a valid token pair', () => {
+    const storage = new MemoryStorage()
+    const store = createSessionStore(storage)
+
+    store.set(session)
+
+    expect(store.get()).toEqual(session)
+    expect(createSessionStore(storage).get()).toEqual(session)
+  })
+
+  it('notifies subscribers when the session changes', () => {
+    const store = createSessionStore(new MemoryStorage())
+    const listener = vi.fn()
+    const unsubscribe = store.subscribe(listener)
+
+    store.set(session)
+    store.clear()
+    unsubscribe()
+    store.set(session)
+
+    expect(listener).toHaveBeenCalledTimes(2)
+  })
+
+  it('discards malformed browser state', () => {
+    const storage = new MemoryStorage()
+    storage.setItem('mygo.auth.session', '{"access_token":true}')
+
+    const store = createSessionStore(storage)
+
+    expect(store.get()).toBeNull()
+    expect(storage.getItem('mygo.auth.session')).toBeNull()
+  })
+})

web/src/api/session.ts

@@ -0,0 +1,87 @@
+import type { TokenPair } from './types.ts'
+
+const sessionStorageKey = 'mygo.auth.session'
+
+type SessionListener = () => void
+type SessionStorage = Pick<Storage, 'getItem' | 'removeItem' | 'setItem'>
+
+export interface SessionStore {
+  clear: () => void
+  get: () => TokenPair | null
+  set: (session: TokenPair) => void
+  subscribe: (listener: SessionListener) => () => void
+}
+
+function isTokenPair(value: unknown): value is TokenPair {
+  if (typeof value !== 'object' || value === null) {
+    return false
+  }
+
+  const candidate = value as Partial<TokenPair>
+  return (
+    typeof candidate.access_token === 'string' &&
+    candidate.access_token.length > 0 &&
+    typeof candidate.refresh_token === 'string' &&
+    candidate.refresh_token.length > 0
+  )
+}
+
+function readStoredSession(storage?: SessionStorage): TokenPair | null {
+  if (!storage) {
+    return null
+  }
+
+  const raw = storage.getItem(sessionStorageKey)
+  if (!raw) {
+    return null
+  }
+
+  try {
+    const parsed: unknown = JSON.parse(raw)
+    if (isTokenPair(parsed)) {
+      return parsed
+    }
+  } catch {
+    // Invalid browser state is treated as a signed-out session.
+  }
+
+  storage.removeItem(sessionStorageKey)
+  return null
+}
+
+export function createSessionStore(storage?: SessionStorage): SessionStore {
+  let currentSession = readStoredSession(storage)
+  const listeners = new Set<SessionListener>()
+
+  const notify = () => {
+    for (const listener of listeners) {
+      listener()
+    }
+  }
+
+  return {
+    get: () => currentSession,
+    set: (session) => {
+      currentSession = session
+      storage?.setItem(sessionStorageKey, JSON.stringify(session))
+      notify()
+    },
+    clear: () => {
+      if (currentSession === null && !storage?.getItem(sessionStorageKey)) {
+        return
+      }
+      currentSession = null
+      storage?.removeItem(sessionStorageKey)
+      notify()
+    },
+    subscribe: (listener) => {
+      listeners.add(listener)
+      return () => listeners.delete(listener)
+    },
+  }
+}
+
+const browserStorage =
+  typeof window === 'undefined' ? undefined : window.sessionStorage
+
+export const sessionStore = createSessionStore(browserStorage)

web/src/api/types.ts

@@ -0,0 +1,28 @@
+export interface TokenPair {
+  access_token: string
+  refresh_token: string
+}
+
+export interface ErrorResponse {
+  error: {
+    message: string
+    log_id?: string
+  }
+}
+
+export interface FileInfo {
+  id: string
+  user_id: string
+  parent_id: string | null
+  name: string
+  size: number
+  mime_type: string
+  is_dir: boolean
+  created_at: string
+  updated_at: string
+}
+
+export interface FileListResponse {
+  files: FileInfo[]
+  total: number
+}

web/src/app/RequireAuth.tsx

@@ -0,0 +1,15 @@
+import { Navigate, Outlet, useLocation } from 'react-router'
+
+import { useAuthSession } from '../features/auth/useAuthSession.ts'
+
+export function RequireAuth() {
+  const session = useAuthSession()
+  const location = useLocation()
+
+  if (!session) {
+    const from = `${location.pathname}${location.search}${location.hash}`
+    return <Navigate to="/login" replace state={{ from }} />
+  }
+
+  return <Outlet />
+}

web/src/app/providers.tsx

@@ -1,14 +1,60 @@
-import type { PropsWithChildren } from 'react'
+import {
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+  QueryClient,
+  QueryClientProvider,
+  useQueryClient,
+} from '@tanstack/react-query'
 import { App as AntDesignApp, ConfigProvider } from 'antd'
+import { useEffect, useRef, type PropsWithChildren } from 'react'
 
-const queryClient = new QueryClient()
+import { ApiError } from '../api/client.ts'
+import { useAuthSession } from '../features/auth/useAuthSession.ts'
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      retry: (failureCount, error) => {
+        if (error instanceof ApiError && error.status < 500) {
+          return false
+        }
+        return failureCount < 2
+      },
+    },
+    mutations: {
+      retry: false,
+    },
+  },
+})
+
+function AuthCacheBoundary({ children }: PropsWithChildren) {
+  const session = useAuthSession()
+  const activeQueryClient = useQueryClient()
+  const previousSession = useRef(session)
+
+  useEffect(() => {
+    if (previousSession.current && !session) {
+      activeQueryClient.clear()
+    }
+    previousSession.current = session
+  }, [activeQueryClient, session])
+
+  return children
+}
 
 export function AppProviders({ children }: PropsWithChildren) {
   return (
     <QueryClientProvider client={queryClient}>
-      <ConfigProvider>
+      <ConfigProvider
-        <AntDesignApp>{children}</AntDesignApp>
+        theme={{
+          token: {
+            borderRadius: 8,
+            colorBgLayout: '#f5f7fb',
+            colorPrimary: '#2563eb',
+          },
+        }}
+      >
+        <AntDesignApp>
+          <AuthCacheBoundary>{children}</AuthCacheBoundary>
+        </AntDesignApp>
       </ConfigProvider>
     </QueryClientProvider>
   )

web/src/app/router.tsx

@@ -1,12 +1,29 @@
 import { createBrowserRouter } from 'react-router'
 
-import { HomePage } from '../pages/HomePage.tsx'
+import { AppShell } from '../components/AppShell.tsx'
+import { FilesPage } from '../pages/FilesPage.tsx'
+import { LoginPage } from '../pages/LoginPage.tsx'
 import { NotFoundPage } from '../pages/NotFoundPage.tsx'
+import { RequireAuth } from './RequireAuth.tsx'
 
 export const router = createBrowserRouter([
+  {
+    path: '/login',
+    element: <LoginPage />,
+  },
+  {
+    element: <RequireAuth />,
+    children: [
+      {
+        element: <AppShell />,
+        children: [
           {
             path: '/',
-    element: <HomePage />,
+            element: <FilesPage />,
+          },
+        ],
+      },
+    ],
   },
   {
     path: '*',

web/src/components/AppShell.tsx

@@ -0,0 +1,86 @@
+import {
+  CloudOutlined,
+  FolderOpenOutlined,
+  LogoutOutlined,
+} from '@ant-design/icons'
+import { useQueryClient } from '@tanstack/react-query'
+import { App, Button, Layout, Menu, Typography } from 'antd'
+import { useState } from 'react'
+import { Outlet, useLocation, useNavigate } from 'react-router'
+
+import { logout } from '../api/auth.ts'
+import { ApiError } from '../api/client.ts'
+import { sessionStore } from '../api/session.ts'
+
+const { Content, Header } = Layout
+
+export function AppShell() {
+  const { message } = App.useApp()
+  const location = useLocation()
+  const navigate = useNavigate()
+  const queryClient = useQueryClient()
+  const [isLoggingOut, setIsLoggingOut] = useState(false)
+
+  const handleLogout = async () => {
+    const refreshToken = sessionStore.get()?.refresh_token
+    setIsLoggingOut(true)
+
+    try {
+      if (refreshToken) {
+        await logout(refreshToken)
+      }
+    } catch (error) {
+      const detail = error instanceof ApiError ? error.message : 'Server unavailable'
+      message.warning(`Signed out locally. ${detail}`)
+    } finally {
+      sessionStore.clear()
+      queryClient.clear()
+      navigate('/login', { replace: true })
+      setIsLoggingOut(false)
+    }
+  }
+
+  return (
+    <Layout className="min-h-screen">
+      <Header className="flex items-center gap-4 px-4 sm:px-6">
+        <button
+          type="button"
+          className="flex shrink-0 cursor-pointer items-center gap-2 border-0 bg-transparent p-0 text-white"
+          onClick={() => navigate('/')}
+        >
+          <CloudOutlined className="text-xl" />
+          <Typography.Text className="hidden text-base font-semibold text-white sm:inline">
+            MyGO
+          </Typography.Text>
+        </button>
+        <Menu
+          className="min-w-0 flex-1"
+          theme="dark"
+          mode="horizontal"
+          selectedKeys={location.pathname === '/' ? ['files'] : []}
+          items={[
+            {
+              key: 'files',
+              icon: <FolderOpenOutlined />,
+              label: 'Files',
+              onClick: () => navigate('/'),
+            },
+          ]}
+        />
+        <Button
+          ghost
+          icon={<LogoutOutlined />}
+          loading={isLoggingOut}
+          onClick={handleLogout}
+        >
+          <span className="hidden sm:inline">Log out</span>
+        </Button>
+      </Header>
+      <Content className="p-4 sm:p-6">
+        <div className="mx-auto w-full max-w-7xl">
+          <Outlet />
+        </div>
+      </Content>
+    </Layout>
+  )
+}

web/src/features/auth/useAuthSession.ts

@@ -0,0 +1,11 @@
+import { useSyncExternalStore } from 'react'
+
+import { sessionStore } from '../../api/session.ts'
+
+export function useAuthSession() {
+  return useSyncExternalStore(
+    sessionStore.subscribe,
+    sessionStore.get,
+    sessionStore.get,
+  )
+}

web/src/index.css

@@ -5,9 +5,10 @@ html,
 body,
 #root {
   min-width: 320px;
-  min-height: 100%;
+  min-height: 100vh;
 }
 
 body {
   margin: 0;
+  background: #f5f7fb;
 }

web/src/pages/FilesPage.tsx

@@ -0,0 +1,241 @@
+import {
+  DownloadOutlined,
+  FileOutlined,
+  FolderFilled,
+  ReloadOutlined,
+  UploadOutlined,
+} from '@ant-design/icons'
+import { keepPreviousData, useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import {
+  Alert,
+  App,
+  Button,
+  Card,
+  Empty,
+  Space,
+  Table,
+  Tag,
+  Typography,
+  type TableColumnsType,
+} from 'antd'
+import { useRef, useState, type ChangeEvent } from 'react'
+
+import { ApiError } from '../api/client.ts'
+import { downloadFile, listRootFiles, uploadRootFile } from '../api/files.ts'
+import type { FileInfo } from '../api/types.ts'
+
+const pageSize = 50
+
+function formatBytes(bytes: number) {
+  if (bytes === 0) {
+    return '0 B'
+  }
+
+  const units = ['B', 'KiB', 'MiB', 'GiB', 'TiB']
+  const unitIndex = Math.min(
+    Math.floor(Math.log(bytes) / Math.log(1024)),
+    units.length - 1,
+  )
+  const value = bytes / 1024 ** unitIndex
+  return `${value.toFixed(unitIndex === 0 || value >= 10 ? 0 : 1)} ${units[unitIndex]}`
+}
+
+function formatDate(value: string) {
+  return new Intl.DateTimeFormat(undefined, {
+    dateStyle: 'medium',
+    timeStyle: 'short',
+  }).format(new Date(value))
+}
+
+function errorMessage(error: unknown) {
+  return error instanceof ApiError ? error.message : 'Unable to reach the server'
+}
+
+export function FilesPage() {
+  const { message } = App.useApp()
+  const queryClient = useQueryClient()
+  const fileInput = useRef<HTMLInputElement>(null)
+  const [page, setPage] = useState(1)
+  const [downloadingID, setDownloadingID] = useState<string | null>(null)
+
+  const filesQuery = useQuery({
+    queryKey: ['files', 'root', page],
+    queryFn: ({ signal }) => listRootFiles((page - 1) * pageSize, pageSize, signal),
+    placeholderData: keepPreviousData,
+  })
+
+  const uploadMutation = useMutation({
+    mutationFn: uploadRootFile,
+    onSuccess: async (file) => {
+      message.success(`${file.name} uploaded`)
+      setPage(1)
+      await queryClient.invalidateQueries({ queryKey: ['files', 'root'] })
+    },
+    onError: (error) => message.error(errorMessage(error)),
+  })
+
+  const handleFileSelected = (event: ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files?.[0]
+    event.target.value = ''
+    if (file && !uploadMutation.isPending) {
+      uploadMutation.mutate(file)
+    }
+  }
+
+  const handleDownload = async (file: FileInfo) => {
+    setDownloadingID(file.id)
+    try {
+      const blob = await downloadFile(file.id)
+      const objectURL = URL.createObjectURL(blob)
+      const anchor = document.createElement('a')
+      anchor.href = objectURL
+      anchor.download = file.name
+      document.body.append(anchor)
+      anchor.click()
+      anchor.remove()
+      window.setTimeout(() => URL.revokeObjectURL(objectURL), 0)
+    } catch (error) {
+      message.error(errorMessage(error))
+    } finally {
+      setDownloadingID(null)
+    }
+  }
+
+  const columns: TableColumnsType<FileInfo> = [
+    {
+      title: 'Name',
+      dataIndex: 'name',
+      key: 'name',
+      render: (name: string, file) => (
+        <Space>
+          {file.is_dir ? (
+            <FolderFilled className="text-amber-500" />
+          ) : (
+            <FileOutlined className="text-blue-600" />
+          )}
+          <Typography.Text ellipsis={{ tooltip: name }}>{name}</Typography.Text>
+        </Space>
+      ),
+    },
+    {
+      title: 'Type',
+      key: 'type',
+      width: 220,
+      responsive: ['md'],
+      render: (_, file) =>
+        file.is_dir ? <Tag color="gold">Folder</Tag> : file.mime_type || 'File',
+    },
+    {
+      title: 'Size',
+      dataIndex: 'size',
+      key: 'size',
+      width: 120,
+      responsive: ['sm'],
+      render: (size: number, file) => (file.is_dir ? '—' : formatBytes(size)),
+    },
+    {
+      title: 'Modified',
+      dataIndex: 'updated_at',
+      key: 'updated_at',
+      width: 190,
+      responsive: ['lg'],
+      render: formatDate,
+    },
+    {
+      title: 'Action',
+      key: 'action',
+      align: 'right',
+      width: 120,
+      render: (_, file) =>
+        file.is_dir ? (
+          <Typography.Text type="secondary">—</Typography.Text>
+        ) : (
+          <Button
+            type="link"
+            icon={<DownloadOutlined />}
+            loading={downloadingID === file.id}
+            onClick={() => handleDownload(file)}
+          >
+            Download
+          </Button>
+        ),
+    },
+  ]
+
+  if (filesQuery.isError && !filesQuery.data) {
+    return (
+      <Alert
+        showIcon
+        type="error"
+        message="Unable to load files"
+        description={errorMessage(filesQuery.error)}
+        action={
+          <Button icon={<ReloadOutlined />} onClick={() => filesQuery.refetch()}>
+            Retry
+          </Button>
+        }
+      />
+    )
+  }
+
+  return (
+    <Card>
+      <div className="mb-5 flex flex-wrap items-start justify-between gap-4">
+        <div>
+          <Typography.Title level={2} className="mb-1!">
+            Files
+          </Typography.Title>
+          <Typography.Text type="secondary">
+            Files stored in your root directory.
+          </Typography.Text>
+        </div>
+        <input
+          ref={fileInput}
+          className="hidden"
+          type="file"
+          onChange={handleFileSelected}
+        />
+        <Button
+          type="primary"
+          icon={<UploadOutlined />}
+          loading={uploadMutation.isPending}
+          onClick={() => fileInput.current?.click()}
+        >
+          Upload file
+        </Button>
+      </div>
+
+      <Table<FileInfo>
+        rowKey="id"
+        columns={columns}
+        dataSource={filesQuery.data?.files ?? []}
+        loading={filesQuery.isLoading || filesQuery.isFetching}
+        locale={{
+          emptyText: (
+            <Empty
+              image={Empty.PRESENTED_IMAGE_SIMPLE}
+              description="No files in your root directory"
+            >
+              <Button
+                type="primary"
+                loading={uploadMutation.isPending}
+                onClick={() => fileInput.current?.click()}
+              >
+                Upload your first file
+              </Button>
+            </Empty>
+          ),
+        }}
+        pagination={{
+          current: page,
+          pageSize,
+          total: filesQuery.data?.total ?? 0,
+          showSizeChanger: false,
+          showTotal: (total) => `${total} item${total === 1 ? '' : 's'}`,
+          onChange: setPage,
+        }}
+        scroll={{ x: 640 }}
+      />
+    </Card>
+  )
+}

web/src/pages/HomePage.tsx

@@ -1,19 +0,0 @@
-import { Card, Space, Tag, Typography } from 'antd'
-
-const { Paragraph, Title } = Typography
-
-export function HomePage() {
-  return (
-    <main className="grid min-h-screen place-items-center bg-slate-50 p-6">
-      <Card className="w-full max-w-xl">
-        <Space orientation="vertical" size="middle">
-          <Tag color="blue">MyGO Web</Tag>
-          <Title level={1}>MyGO</Title>
-          <Paragraph>
-            The client-side web application foundation is ready.
-          </Paragraph>
-        </Space>
-      </Card>
-    </main>
-  )
-}

web/src/pages/LoginPage.tsx

@@ -0,0 +1,113 @@
+import { CloudOutlined, LockOutlined, MailOutlined } from '@ant-design/icons'
+import { useMutation } from '@tanstack/react-query'
+import { Alert, Button, Card, Form, Input, Space, Typography } from 'antd'
+import { Navigate, useLocation, useNavigate } from 'react-router'
+
+import { login } from '../api/auth.ts'
+import { ApiError } from '../api/client.ts'
+import { sessionStore } from '../api/session.ts'
+import { useAuthSession } from '../features/auth/useAuthSession.ts'
+
+interface LoginValues {
+  email: string
+  password: string
+}
+
+interface LoginLocationState {
+  from?: unknown
+}
+
+function destinationFromState(state: unknown) {
+  const from = (state as LoginLocationState | null)?.from
+  return typeof from === 'string' && from.startsWith('/') ? from : '/'
+}
+
+export function LoginPage() {
+  const session = useAuthSession()
+  const location = useLocation()
+  const navigate = useNavigate()
+  const destination = destinationFromState(location.state)
+
+  const loginMutation = useMutation({
+    mutationFn: ({ email, password }: LoginValues) => login(email, password),
+    onSuccess: (tokenPair) => {
+      sessionStore.set(tokenPair)
+      navigate(destination, { replace: true })
+    },
+  })
+
+  if (session) {
+    return <Navigate to="/" replace />
+  }
+
+  const errorMessage = loginMutation.error
+    ? loginMutation.error instanceof ApiError
+      ? loginMutation.error.message
+      : 'Unable to reach the server'
+    : null
+
+  return (
+    <main className="grid min-h-screen place-items-center bg-slate-100 p-4">
+      <Card className="w-full max-w-md shadow-sm">
+        <Space orientation="vertical" size="large" className="w-full">
+          <div className="text-center">
+            <CloudOutlined className="mb-3 text-4xl text-blue-600" />
+            <Typography.Title level={1} className="mb-1!">
+              Sign in to MyGO
+            </Typography.Title>
+            <Typography.Text type="secondary">
+              Access your files from this browser session.
+            </Typography.Text>
+          </div>
+
+          {errorMessage && (
+            <Alert type="error" showIcon message="Sign-in failed" description={errorMessage} />
+          )}
+
+          <Form<LoginValues>
+            layout="vertical"
+            requiredMark={false}
+            onFinish={(values) => loginMutation.mutate(values)}
+          >
+            <Form.Item
+              label="Email"
+              name="email"
+              rules={[
+                { required: true, message: 'Enter your email address' },
+                { type: 'email', message: 'Enter a valid email address' },
+              ]}
+            >
+              <Input
+                autoComplete="email"
+                prefix={<MailOutlined />}
+                placeholder="you@example.com"
+                size="large"
+              />
+            </Form.Item>
+            <Form.Item
+              label="Password"
+              name="password"
+              rules={[{ required: true, message: 'Enter your password' }]}
+            >
+              <Input.Password
+                autoComplete="current-password"
+                prefix={<LockOutlined />}
+                placeholder="Password"
+                size="large"
+              />
+            </Form.Item>
+            <Button
+              block
+              htmlType="submit"
+              loading={loginMutation.isPending}
+              size="large"
+              type="primary"
+            >
+              Sign in
+            </Button>
+          </Form>
+        </Space>
+      </Card>
+    </main>
+  )
+}

web/vite.config.ts

@@ -4,4 +4,9 @@ import tailwindcss from '@tailwindcss/vite'
 
 export default defineConfig({
   plugins: [react(), tailwindcss()],
+  server: {
+    proxy: {
+      '/api': 'http://127.0.0.1:10086',
+    },
+  },
 })

web/vitest.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: {
+    include: ['src/**/*.test.{ts,tsx}'],
+  },
+})