fix: disable Ctrl+C exit, copy works via textarea native

changelog.md

@@ -17,8 +17,8 @@ All notable changes to this project will be documented in this file.
 - **Multi-select delete**: Double-click to enter selection mode, click to toggle selection, batch delete support
 - **Title truncation**: Long titles in the list display with ellipsis
 - **Time display**: Format "time · month/day/year", e.g., "12:45 · 4/11/2026"
-- **Copy to clipboard**: Press Ctrl+C to copy current note (title + content)
-- **Exit**: Press Ctrl+D to exit (replaces default Ctrl+C)
+- **Copy**: In edit mode, use Shift+Arrow to select text, then Ctrl+C to copy
+- **Exit**: Press Ctrl+D to exit
 
 ### Technical
 
@@ -39,6 +39,7 @@ npm run build  # Build to mio.exe
 
 ### Keyboard Shortcuts
 
-- `Ctrl+C` - Copy current note to clipboard
+- `Shift+Arrow` - Select text in edit mode
+- `Ctrl+C` - Copy selected text (in edit mode)
 - `Ctrl+D` - Exit application
 - `Esc` - Exit application (alternative)