feat(android): chat base feature (#12684)

- **feat(android): chat send & receive**
- **[WIP] feat(android): markdown style for chat**
- **fix(android): fix auto scroll & ai message id replacement**
- **feat(android): replace icons**
- **refactor(android): design system**
- **feat(android): markdown style for chat**

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Introduced a comprehensive custom theme system with new color palettes, typography, and theme modes (Light, Dark, System).
  - Added support for rendering Markdown-formatted text in chat messages with custom styling.
  - Integrated new vector icons for UI elements such as lists, camera, image, send, close, and more.
  - Added composable icon and icon button components for consistent icon usage across the app.

- **Enhancements**
  - Updated chat UI to use the new theme, icons, and Markdown rendering for AI messages.
  - Improved chat message management and send button state handling with enhanced session retrieval and SSE stream processing.
  - Refined app bar and dropdown menu components with updated icons and theme integration.
  - Enhanced floating action button appearance with tinted vector drawable.
  - Unified UI components and styling under the AFFiNE design system in chat input and app bars.

- **Bug Fixes**
  - Corrected application and theme class naming for consistency.

- **Chores**
  - Added new dependencies for rich text and Markdown support.
  - Updated color and icon resources for a unified visual style.
  - Removed deprecated headers from authentication requests.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/android/App/gradle/libs.versions.toml

@@ -34,6 +34,7 @@ ksp = "2.1.20-2.0.1"
 minSdk = "22"
 mozilla-rust-android = "0.9.6"
 okhttp-bom = "5.0.0-alpha.14"
+richtext = "1.0.0-alpha02"
 # @keep
 targetSdk = "35"
 timber = "5.0.1"
@@ -90,6 +91,8 @@ okhttp-bom = { module = "com.squareup.okhttp3:okhttp-bom", version.ref = "okhttp
 okhttp-coroutines = { module = "com.squareup.okhttp3:okhttp-coroutines" }
 okhttp-logging = { module = "com.squareup.okhttp3:logging-interceptor" }
 okhttp-sse = { module = "com.squareup.okhttp3:okhttp-sse" }
+richtext-commonmark = { module = "com.halilibo.compose-richtext:richtext-commonmark", version.ref = "richtext" }
+richtext-ui = { module = "com.halilibo.compose-richtext:richtext-ui", version.ref = "richtext" }
 timber = { module = "com.jakewharton.timber:timber", version.ref = "timber" }
 
 [plugins]