Initial commit: Fabled Android app

Flutter Android client for FabledAssistant with:
- Session-cookie auth via persistent cookie jar (Dio + cookie_jar)
- OAuth/SSO login via in-app WebView (flutter_inappwebview)
- Notes: list, detail (markdown render), create/edit
- Tasks: list with status tabs, create/edit with priority
- Chat: SSE streaming bubbles, conversation management
- Quick Capture FAB for rapid note/task creation
- Settings screen (change server URL, logout)
- Android home screen widget → opens chat
- Riverpod state management, go_router navigation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# Fabled — Android App
+
+Native Android client for [FabledAssistant](https://github.com/yourusername/fabledassistant), a self-hosted AI productivity assistant.
+
+## Features
+
+- **Notes** — create, edit, and browse markdown notes
+- **Tasks** — manage tasks with status (To Do / In Progress / Done) and priority
+- **Chat** — streaming AI conversations with real-time SSE response display
+- **Quick Capture** — FAB shortcut to create a note or task from anywhere
+- **OAuth / SSO** — authenticates via your server's configured OIDC provider; local username/password login also supported if enabled on the server
+- **Session persistence** — stays logged in across app restarts via a persistent cookie jar
+- **Home screen widget** — tap to open the chat screen directly from the Android launcher
+
+## Requirements
+
+- A running [FabledAssistant](https://github.com/yourusername/fabledassistant) server (self-hosted)
+- Android 5.0+ (API 21)
+
+## Getting Started
+
+### Prerequisites
+
+- Flutter 3.x SDK
+- Android Studio (for Android SDK and emulator)
+- JDK 17
+
+### Setup
+
+```bash
+flutter pub get
+flutter run
+```
+
+On first launch, enter your FabledAssistant server URL (e.g. `https://fabled.example.com`) and sign in.
+
+## Architecture
+
+```
+lib/
+├── main.dart                  # Entry point; resolves async deps before runApp
+├── app.dart                   # GoRouter + auth redirect guards + shell nav
+├── core/
+│   ├── constants.dart         # Route name constants
+│   └── exceptions.dart        # AppException hierarchy
+├── data/
+│   ├── api/                   # Dio HTTP layer (one class per resource)
+│   ├── models/                # Plain Dart models with fromJson/toJson
+│   └── repositories/          # Thin wrappers over API classes
+└── providers/                 # Riverpod providers (state + dependency wiring)
+    screens/                   # Flutter UI screens
+```
+
+**Key packages:** `flutter_riverpod`, `go_router`, `dio` + `cookie_jar`, `flutter_inappwebview`, `flutter_markdown`
+
+## Building a Release APK
+
+```bash
+flutter build apk --release
+```
+
+The signed APK will be at `build/app/outputs/flutter-apk/app-release.apk`.