docs: complete phase 8

Marked Phase 8 (Mouse Support) as complete. The editor now supports standard mouse interactions including scrolling, clicking to move cursor, and dragging to select text.

DEV_STATE.md

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 ## Current Module
 
-**Phase 7: Performance Optimization** - optimization of rendering pipeline, input handling, and resource usage.
+**Phase 8: Mouse Support & Advanced UI** - Implementing mouse interaction (click, scroll, drag-selection) and advanced UI elements.
 
 
 
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 ## Done
 
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 - ✅ **Phase 1-5**: Complete Emacs-like core functionality
 
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 - ✅ **Phase 6 Core**: GTK4 frontend with text rendering
 
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+- ✅ **Phase 7 Optimization**: Render caching and performance tuning
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+- ✅ **Phase 8 Mouse**: Full mouse support (click-move, scroll, drag-select)
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 - ✅ **Input System**: Full keyboard input with modifiers working
 
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 - ✅ **Cursor System**: Emacs-style blinking block cursor with color inversion
 
 - ✅ **Text Editing**: Basic insertion, deletion, movement operations working
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-1. **Phase 8**: Mouse support and advanced UI features
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+1. **Phase 9**: Advanced UI features (Context Menus, Tooltips)
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+2. **Phase 10**: Plugin System enhancements
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@@ -182,7 +222,27 @@ Lumacs/
 
 
 
-**Phase 7 COMPLETED**:
+**Phase 8 COMPLETED**:
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+- Implemented Scroll Wheel support (view scrolling with cursor tracking)
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+- Implemented Click-to-Move cursor logic with boundary checks
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+- Implemented Drag-to-Select (GestureDrag) for region selection
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+**Ready for Final Polish / Phase 9**