Add session log documenting components and ModeTemplate

SESSION_LOG.md

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+# Session Log - January 21, 2026
+
+## Summary
+
+Created reusable components and ModeTemplate as the foundation for building new Modes.
+
+## Components Created
+
+### `/components/auth/`
+- Microsoft OAuth → PocketBase token flow
+- Users must already exist in PocketBase (no user creation)
+- Files: `microsoft-oauth.ts`, `types.ts`, `index.ts`, `README.md`
+- Uses env vars: `MICROSOFT_CLIENT_ID`, `MICROSOFT_CLIENT_SECRET`, `MICROSOFT_TENANT_ID`, `MICROSOFT_REDIRECT_URI`, `MICROSOFT_SCOPES`, `PB_URL`
+
+### `/components/api-client/`
+- Frontend HTTP client with auth headers
+- Self-contained (no cross-component dependencies)
+- Files: `api-client.ts`, `index.ts`, `README.md`
+
+### `/components/shared-types/`
+- Common types for frontend/backend consistency
+- Types: `User`, `AuthState`, `ApiResult`, `PaginatedResponse`, `CreateInput`, `UpdateInput`
+- Files: `types.ts`, `index.ts`, `README.md`
+
+## ModeTemplate Created
+
+Full project template at `/ModeTemplate/`:
+
+**Backend** (`backend/`):
+- Hono server with auth routes
+- Auth module copied from components
+- Serves static frontend build
+
+**Frontend** (`frontend/`):
+- SvelteKit with Svelte 5 runes
+- Class-based auth store with SSR-safe `hydrate()` pattern
+- Routes: `/`, `/callback`
+- Builds to `build/` for static serving
+
+**Types** (`types/`):
+- Copied from shared-types component
+
+## Key Patterns Established
+
+1. **Auth Store (Svelte 5)**: Class-based with `$state` and `$derived`, `hydrate()` called in `onMount()`
+2. **SSR Safety**: All `localStorage`/`window` access guarded with `typeof` checks
+3. **Components**: Pure source files, no package.json - inherit from consuming project
+4. **Modes**: Standalone with all dependencies copied in, no external references
+
+## Commits
+
+- `05f8e2e` - Add ModeTemplate with Svelte 5 frontend and components (120 files)
+
+## Next Steps
+
+- Copy ModeTemplate to create new Modes
+- Implement mode-specific features in each copy
+- Components serve as reference - copy to modes, don't import across folders