fix: Prevent key bubbling in Review Changes screen

Fixed bug where pressing keys like 'c' in the Review Changes screen
would accidentally trigger app-level shortcuts (e.g., Edit Category modal).
Now all unhandled keystrokes are stopped at the screen level.

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

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

Author: wesm

moneyflow/screens/review_screen.py

@@ -140,3 +140,7 @@ def on_key(self, event: Key) -> None:
         elif event.key == "enter":
             event.stop()  # Prevent event from bubbling
             self.dismiss(True)  # Commit
+        else:
+            # Stop all other keys from bubbling to parent app
+            # This prevents accidental activation of app-level shortcuts (like 'c' for edit category)
+            event.stop()