Fix context menu accessibility, conversation replies, and integrate polls into post details

This commit addresses several critical accessibility and functionality issues:

- Fix context menu keyboard shortcuts (Applications key and Shift+F10) in messages tab
- Resolve 404 errors when replying to private message conversations by implementing separate conversation reply handling
- Restore Enter key functionality for viewing post details
- Integrate poll voting into post details dialog as first tab instead of separate dialog
- Fix accessibility issues with poll display using QTextEdit and accessible list patterns
- Add comprehensive accessibility guidelines to CLAUDE.md covering widget choices, list patterns, and context menu support
- Update README.md with new features including context menu shortcuts, poll integration, and accessibility improvements

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

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

README.md

@@ -28,7 +28,7 @@ This project was created through "vibe coding" - a collaborative development app
 - **User Profile Viewer**: Comprehensive profile viewing with bio, fields, recent posts, and social actions
 - **Social Features**: Follow/unfollow, block/unblock, and mute/unmute users directly from profiles
 - **Media Uploads**: Attach images, videos, and audio files with accessibility-compliant alt text
-- **Post Details**: Press Enter on any post to see detailed interaction information
+- **Post Details**: Press Enter on any post to see detailed interaction information with poll integration
 - **Thread Expansion**: Full conversation context fetching for complete thread viewing
 - **Blocked/Muted Management**: Dedicated tabs for managing blocked and muted users
 - **Custom Emoji Support**: Instance-specific emoji support with caching
@@ -94,6 +94,7 @@ Bifrost includes a sophisticated sound system with:
 - **Ctrl+U**: Open URLs from selected post in browser
 - **Ctrl+Shift+B**: Block user who authored selected post
 - **Ctrl+Shift+M**: Mute user who authored selected post
+- **Applications Key/Shift+F10**: Open context menu with all post actions
 
 ### Navigation
 - **Arrow Keys**: Navigate through posts
@@ -263,6 +264,7 @@ Bifrost includes comprehensive poll support with full accessibility:
 - **Vote Submission**: Submit votes with accessible button controls
 
 ### Viewing Results
+- **Integrated Display**: Poll results shown in post details dialog as first tab
 - **Automatic Display**: Results shown immediately after voting or for expired polls
 - **Navigable List**: Vote counts and percentages in an accessible list widget
 - **Arrow Key Navigation**: Review each option's results individually
@@ -273,6 +275,8 @@ Bifrost includes comprehensive poll support with full accessibility:
 - **Keyboard Only**: Complete functionality without mouse interaction
 - **Clear Announcements**: Descriptive text for poll status and options
 - **Focus Management**: Proper tab order and focus placement
+- **Accessible Results**: Poll results displayed using accessible QListWidget pattern
+- **Context Menu Support**: All poll actions available via context menu shortcuts
 - **Error Handling**: Accessible feedback for voting errors (duplicate votes, etc.)
 
 ## Accessibility Features
@@ -283,6 +287,9 @@ Bifrost includes comprehensive poll support with full accessibility:
 - Accessible names and descriptions for all controls
 - Thread expansion/collapse with audio feedback
 - Poll creation and voting with full accessibility support
+- Context menu support with Applications key and Shift+F10
+- Accessible content display using QTextEdit for complex information
+- Private message conversations with proper threading
 
 ### Known Qt Display Quirk