1.0.1

release: v1.0.1

- error handling: central reportError() → banner + Command Log, generic toast
- stash: persist include-untracked default; warn when only untracked selected
- changes/history: refinements to ChangesView + HistoryCommitChanges
- tabs: use accent design tokens; keep active-tab close icon visible
- remove the What's New / Changelog view and its version gate
- bump app version to 1.0.1