Add comprehensive profile editing functionality with accessibility features

- Added update_credentials method to ActivityPub client for profile API calls
- Created ProfileEditDialog with tabbed interface for editing profile information
- Implemented profile fields management with accessible list navigation
- Added HTML stripping for clean display of profile field content
- Integrated profile editing into File menu with Ctrl+Alt+E shortcut
- Fixed Tab key accessibility in biography text field
- Updated documentation with new feature and keyboard shortcut

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

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

CLAUDE.md

@@ -433,6 +433,7 @@ Due to Qt's visual display synchronization, thread collapse may require double-o
 - **Ctrl+S**: Open Search dialog for users, hashtags, and posts
 - **Ctrl+Shift+F**: Open Timeline Filters dialog
 - **Ctrl+Shift+E**: Edit selected post (your own posts only)
+- **Ctrl+Alt+E**: Edit your profile (display name, bio, fields, privacy settings)
 - **Shift+Delete**: Delete selected post (your own posts only)
 - **F5**: Refresh timeline
 - **Ctrl+,**: Settings
@@ -560,6 +561,7 @@ verbose_announcements = true
 - **Timeline Filtering**: ✅ Filter home timeline by content type (replies, boosts, mentions) and media
 - **Search Dialog**: ✅ Dedicated search interface with tabbed results and background processing
 - **Filter Dialog**: ✅ Timeline filter configuration with real-time application
+- **Profile Editing**: ✅ Edit your profile information including display name, bio, profile fields, and privacy settings
 
 ### Remaining High Priority Features
 - **User Blocking Management**: Block/unblock users with dedicated management interface