Major redesign of the post detail view with better visual hierarchy,
community branding, and interactive elements. Introduces a new action
bar component for post interactions.

New PostActionBar widget:
- Dedicated action bar for upvote, downvote, share, and comment actions
- Consistent with feed card actions but optimized for detail view
- Haptic feedback on all interactions
- Proper vote state management

Post detail improvements:
- Custom app bar showing community avatar and styled handle
- Better community branding with fallback avatars
- Removed redundant post card display in detail view
- Cleaner layout with post content displayed directly
- Fixed bottom navigation bar spacing issues
- Integrated share functionality with native share sheet

Visual enhancements:
- Styled community handles with color-coded parts (!community@instance)
- Circular community avatars with fallback to first letter
- Improved spacing and padding throughout
- Better error and loading states

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Improve the comments sort UI with intuitive icons and better visual
feedback. Each sort option now has a matching icon for easier recognition.

Changes:
- Added icons for each sort type (🔥 hot, ✨ top, 🆕 new)
- Show checkmark next to currently selected sort option
- Improved popup menu styling with rounded corners
- Better spacing and alignment in sort dropdown

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Add optional parameters to control visibility of header and actions in
PostCard widget. This allows the same component to be reused in different
contexts (feed vs detail view) with appropriate customization.

Changes:
- Added showActions parameter (default: true) to toggle action buttons
- Added showHeader parameter (default: true) to toggle community/author info
- Adjusted margins and padding based on header visibility
- Maintained backward compatibility with default values

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Replace placeholder share button with actual share functionality using
the share_plus package. Users can now share posts with the post title
and URI through their device's native share sheet.

Changes:
- Added haptic feedback on share button tap for better UX
- Share includes post title (or fallback text) and post URI
- Uses native share sheet for platform-appropriate sharing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Replace hardcoded seedColor with AppColors.primary to ensure Material
widgets and custom components use the same accent color. This creates
a single source of truth for the app's primary color.

Benefits:
- Material widgets (AppBar, Dialogs, etc.) now match custom components
- Changing AppColors.primary updates the entire color scheme
- Eliminates visual inconsistencies between theme and custom colors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Replace the old shark-themed logo with new branding featuring:
- lil_dude.svg: Character mascot (120x120)
- coves_bubble.svg: Brand text/wordmark (180x60)

The new logo layout stacks the character above the brand text with
appropriate spacing. Removed old shark logo files and references.

Also updated landing screen to:
- Remove "Coves" text heading (now part of logo)
- Use new SVG assets with proper sizing
- Update "Create account" button to show "coming soon" snackbar

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Replace all hardcoded orange color values with AppColors.primary constant
for better maintainability and easier theme updates.

Changes:
- PrimaryButton: Use AppColors.primary for background, shadow, and ripple
- LoginScreen: Use AppColors.primary for input focus border and help link
- Placeholder screens: Use AppColors.primary for icon colors
- MainShellScreen: Use AppColors.primary for selected nav item color

This makes it easier to update the accent color across the entire app
by changing a single constant.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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