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tasks/podcast-tui-app/04-authentication.md

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+# 04. Build Optional Authentication System
+
+meta:
+  id: podcast-tui-app-04
+  feature: podcast-tui-app
+  priority: P2
+  depends_on: [03]
+  tags: [authentication, optional, solidjs, security]
+
+objective:
+- Create authentication state management (disabled by default)
+- Build simple login screen with email/password
+- Implement 8-character code validation flow
+- Add OAuth placeholder screens
+- Create sync-only user profile
+
+deliverables:
+- `src/stores/auth.ts` with authentication state store
+- `src/components/LoginScreen.tsx` with login form
+- `src/components/CodeValidation.tsx` with 8-character code input
+- `src/components/OAuthPlaceholder.tsx` with OAuth info
+- `src/components/SyncProfile.tsx` with sync-only profile
+
+steps:
+- Create `src/stores/auth.ts` with Zustand store:
+  - `user` state (initially null)
+  - `isAuthenticated` state (initially false)
+  - `login()` function
+  - `logout()` function
+  - `validateCode()` function
+- Create `src/components/LoginScreen.tsx`:
+  - Email input field
+  - Password input field
+  - Login button
+  - Link to code validation flow
+  - Link to OAuth placeholder
+- Create `src/components/CodeValidation.tsx`:
+  - 8-character code input
+  - Validation logic (alphanumeric)
+  - Submit button
+  - Error message display
+- Create `src/components/OAuthPlaceholder.tsx`:
+  - Display OAuth information
+  - Explain terminal limitations
+  - Link to browser redirect flow
+- Create `src/components/SyncProfile.tsx`:
+  - User profile display
+  - Sync status indicator
+  - Profile management options
+- Add auth screens to Navigation (hidden by default)
+
+tests:
+- Unit: Test authentication state management
+- Unit: Test code validation logic
+- Integration: Test login flow completes
+- Integration: Test logout clears state
+
+acceptance_criteria:
+- Authentication is disabled by default (isAuthenticated = false)
+- Login screen accepts email and password
+- Code validation accepts 8-character codes
+- OAuth placeholder displays limitations
+- Sync profile shows user info
+- Login state persists across sessions
+
+validation:
+- Run application and verify login screen is accessible
+- Try to log in with valid credentials
+- Try to log in with invalid credentials
+- Test code validation with valid/invalid codes
+- Verify authentication state persists
+
+notes:
+- Authentication is optional and disabled by default
+- Focus on file sync, not user accounts
+- Use simple validation (no real backend)
+- Store authentication state in localStorage
+- OAuth not feasible in terminal, document limitation