Compose conversation content

[ThomasSession]

I'm bringing the start of the compose content for the conversation screen so we can start using it in other places.

[Copilot]

Pull request overview

This PR introduces reusable Compose components for rendering conversation messages, refactoring the landing screen to use these new components. The changes create a foundation for consistent message display across the app.

Changes:

• Introduced comprehensive message rendering composables supporting text, media, audio, documents, quotes, and links
• Refactored the landing screen to use the new message composables instead of custom implementations
• Updated theme colors and dimensions to support the new message UI components

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
MessageComposables.kt	New file containing all message rendering composables, data models, and preview functions for various message types
MessageMedia.kt	New file with media message composables supporting 1-3 images/videos with different layout patterns
Landing.kt	Refactored to use new Message composable instead of custom message rendering logic
ThemeColors.kt	Updated text bubble colors for all themes to use theme-specific colors instead of hardcoded black/white
Dimensions.kt	Added message-specific dimensions including corner radius, min width, icon status size, and quote icon size
Colors.kt	Added new black alpha values (blackAlpha12, blackAlpha06) for message backgrounds
Themes.kt	Removed unused imports (AppTextSecurePreferences, dp)
view_visible_message.xml	Added tools:tint attribute for preview support

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