[Bug]: Editing or deleting an action leaves stale keybindings

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/web

Steps to reproduce

1. Open a Git project in T3 Code.
2. Click + Add action.
3. Create an action, assign a keybinding, and save it.
4. Edit the action, focus the keybinding field, press Backspace to clear it, and save.
5. Inspect ~/.t3/userdata/keybindings.json.
6. Assign a different keybinding to the same action and save again.
7. Inspect keybindings.json again, then delete the action and inspect the file once more.

Expected behavior

Clearing an action's keybinding should remove that action's existing entry from keybindings.json. Changing the keybinding should replace the old entry. Deleting the action should remove any keybinding entries for its generated command.

Actual behavior

Clearing the keybinding and saving leaves the old entry in keybindings.json. Assigning a different keybinding adds another entry for the same generated script.<action-id>.run command instead of replacing the old one. Deleting the action also leaves its keybinding entries behind, so stale shortcuts accumulate for an action that no longer exists.

Impact

Minor bug or occasional failure

Version or commit

T3 Code desktop app 0.0.32

Environment

macOS, T3 Code desktop app 0.0.32

Logs or stack traces

Screenshots, recordings, or supporting files

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Workaround

Manually remove the stale entries from ~/.t3/userdata/keybindings.json.

Start in the apps/web action and keybinding save/delete flow, reproduce the steps, and inspect ~/.t3/userdata/keybindings.json after each operation. Done means clearing or changing a binding replaces the prior entry, and deleting an action removes entries for its generated script..run command.