v0.22.1

fix(build): stop renderer from pulling localGit into the browser bundle

The v0.22.0 release failed on every platform with:

  lib/localGit.ts (3:7): "promisify" is not exported by
  "__vite-browser-external", imported by "lib/localGit.ts"

Renderer code imports `isLocalUrl` from `lib/diffSource.ts`, which has
a dynamic `import('./localGit')` for the factory. Vite traces the
whole module graph at build time, so localGit's top-level Node imports
(`util.promisify`, `child_process.execFile`) end up evaluated against
the browser externals and blow up the renderer bundle. No renderer
bundle → no package → no DMG / .exe / deb / rpm.

Extract `isLocalUrl` into `lib/local-url.ts` with zero deps and point
renderer callers (PRSummaryBanner, ReviewPage) there. diffSource.ts
and main.ts keep the same shape but import the helper from the new
home. Verified `electron-forge package` runs clean locally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>