Add a Troubleshooting section under a Support nav group in Settings:
- Open App Data Folder: reveals the user-data directory in the OS file
explorer via shell.openPath.
- Reset Local Workspace: destructive action that deletes workspace.json
and scratchpad contents, clears the in-memory cache, and reseeds
defaults. Auth secrets are preserved. Requires two-step confirmation.
New IPC channels, ElectronApi methods, and preload bridge added for
openAppDataFolder and resetLocalWorkspace. Existing electron mock in
tests updated to include shell.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
