Update documentation for post editing functionality

- Added post editing feature to README.md features list
- Documented keyboard shortcuts: Ctrl+Shift+E (edit) and Shift+Delete (delete)
- Added post editing to CLAUDE.md completed features section
- Updated keyboard shortcuts section in both documentation files
- Clarified that editing only works for user's own posts

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

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

README.md

@@ -32,6 +32,7 @@ This project was created through "vibe coding" - a collaborative development app
 - **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
+- **Post Editing**: Edit your own posts and direct messages with full content preservation
 
 ## Audio System
 
@@ -96,6 +97,8 @@ Bifrost includes a sophisticated sound system with intelligent notification hand
 - **Ctrl+F**: Favorite selected post
 - **Ctrl+C**: Copy selected post to clipboard
 - **Ctrl+U**: Open URLs from selected post in browser
+- **Ctrl+Shift+E**: Edit selected post (your own posts only)
+- **Shift+Delete**: Delete selected post (your own posts only)
 - **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