feat: add copy (Ctrl+C) and exit (Ctrl+D) shortcuts

changelog.md

@@ -17,6 +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)
 
 ### Technical
 
@@ -33,4 +35,10 @@ All notable changes to this project will be documented in this file.
 ```bash
 npm run dev    # Development mode
 npm run build  # Build to mio.exe
-```
+```
+
+### Keyboard Shortcuts
+
+- `Ctrl+C` - Copy current note to clipboard
+- `Ctrl+D` - Exit application
+- `Esc` - Exit application (alternative)