revert(gtk): focus jumping fix is not resolved

Reverting the 'Focus Jumping Fix' status in DEV_STATE.md as the issue persists despite recent changes. This indicates a deeper problem with GTK focus handling or event propagation that requires further investigation.

DEV_STATE.md

@@ -72,7 +72,7 @@ Lumacs/
 - ✅ **Split Window UI Polish**: Fixed modeline display, focus stability, and split ratio calculations
 - ✅ **Window Split Freeze Fix**: Resolved GTK signal_realize callback issues causing freezes during splits
 - ✅ **Split Window Cursor Fix**: Fixed cursor movement to work in focused window rather than original active window
-- ✅ **Focus Jumping Fix**: Resolved issue where typing caused focus to jump back to previous window by using GestureClick instead of EventControllerFocus
+- ⚠️ **Focus Jumping Partial Fix**: Identified spurious next_window() calls but focus still jumps during typing
 
 - ✅ **Split Ratio Improvement**: Implemented initial split ratio using signal_map with fallback