v0.7.0 - WASM-based Editor

What's New

Added

• WASM-based editor: New Rust/WebAssembly editor replacing textarea
  • Ropey-backed text buffer for O(log n) edits on large documents
  • Built-in markdown syntax highlighting (headings, code, bold, links, lists)
  • Virtual scrolling for performance with large files
  • Cursor and selection management in WASM
  • Undo/redo stacks managed in Rust
• History validation: Non-existent files automatically removed from sidebar on startup
• File existence check before loading (handles external file deletion)

Changed

• Editor now uses translate3d + will-change: transform for virtual scroll (fixes WebView scrollbar bug)
• Keyboard shortcuts now case-insensitive
• Clipboard operations now have proper error handling

Fixed

• Scrollbar disappearing during scroll in Tauri WebView (compositor bug workaround)
• Cursor missing after clicking into document
• Scrollbar drag not working (was intercepted by click handler)
• EOL cursor positioning in line_col_to_offset