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>

README.md

@@ -33,6 +33,7 @@ This project was created through "vibe coding" - a collaborative development app
 - **Blocked/Muted Management**: Dedicated tabs for managing blocked and muted users
 - **Custom Emoji Support**: Instance-specific emoji support with caching
 - **Post Editing**: Edit your own posts and direct messages with full content preservation
+- **Profile Editing**: Edit your profile information including display name, bio, profile fields, and privacy settings
 - **Search Functionality**: Search for users, hashtags, and posts across the fediverse with dedicated search interface
 - **Timeline Filtering**: Customize your timeline view by hiding/showing replies, boosts, mentions, and media content
 
@@ -128,6 +129,7 @@ Bifrost includes a sophisticated sound system with intelligent notification hand
 - **Ctrl+Shift+F**: Open Timeline Filters dialog
 - **Ctrl+,**: Open Settings
 - **Ctrl+Shift+A**: Add new account
+- **Ctrl+Alt+E**: Edit your profile
 - **Ctrl+Alt+S**: Open Soundpack Manager
 - **Ctrl+Q**: Quit application