2.1.0

release: v2.1.0 - Capacitor Android shell, host cursor hide

The web viewer is now also packaged as a native Android app via
Capacitor 8. Same Vite/TypeScript codebase ships to web (PWA), Chrome
extension deep-link, and now Google Play / sideload — no separate
codepaths. Plus a getDisplayMedia tweak so the host cursor is no longer
baked into the encoded video, freeing the synthetic cursor introduced
in v1.7.0 to be the only one the viewer sees.

Capacitor + Android
- web-viewer/package.json: pull in @capacitor/core, /android, /haptics,
  /push-notifications, plus the CLI for build commands.
- web-viewer/capacitor.config.ts: appId com.titanxt.viewer, webDir dist
  so `npx cap sync` picks up the Vite output.
- web-viewer/android/: scaffolded Capacitor project with Java
  MainActivity, gradle wrapper, splash + launcher icons, file_paths
  for sharing.
- web-viewer/.gitignore: keep generated build artifacts (.gradle,
  .idea, app/build, local.properties) out of the repo while
  committing the sources.

Host cursor in stream
- connection.ts (host-side getDisplayMedia, both initial + monitor-
  switch paths): pass `cursor: 'never'` so Chromium's screen capture
  pipeline doesn't paint the cursor onto the encoded frames. The
  synthetic cursor we already render on the viewer is now the only
  one the user sees, instead of competing with a baked-in copy that
  always lags ~80ms+ behind.