feat: Add keyboard shortcuts for navigation and action buttons

- Created use-keyboard-shortcuts hook to manage global keyboard shortcuts
- Added navigation shortcuts: K (Kanban), A (Agent), E (Spec Editor), C (Context), T (Tools), S (Settings)
- Added action shortcuts: N (Add Feature on board), F (Add File on context)
- Shortcuts automatically disabled when typing in inputs/textareas or when dialogs are open
- Display shortcut key indicators in navigation links and action buttons
- Added test utilities for keyboard shortcut testing

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

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

.automaker/feature_list.json

@@ -67,6 +67,6 @@
     "category": "Core",
     "description": "Add shortcuts keys to all left navigation links, then add shortcuts to the add buttons on the routes (such as kanbam add feature). mske sure they don't mess with normal input or textarea typing or typeaheads. display the shortkey in link or button for users to know (K)",
     "steps": [],
-    "status": "in_progress"
+    "status": "verified"
   }
 ]