fix: handle undefined shortcuts for users with persisted state

Users with existing persisted state won't have the new terminal
shortcuts, so guard against undefined values.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/app/src/components/views/terminal-view.tsx

@@ -352,7 +352,8 @@ export function TerminalView() {
       const cmdOrCtrl = isMac ? e.metaKey : e.ctrlKey;
 
       // Parse shortcut string to check for match
-      const matchesShortcut = (shortcutStr: string) => {
+      const matchesShortcut = (shortcutStr: string | undefined) => {
+        if (!shortcutStr) return false;
         const parts = shortcutStr.toLowerCase().split('+');
         const key = parts[parts.length - 1];
         const needsCmd = parts.includes('cmd');