Change CLI package publish tag from alpha to latest

Add production favicon set for marketing page (pingdotgg#196)

- add 16x16, 32x32, and Apple touch icon assets
- update `index.astro` head links to reference size-specific favicons

Add Shift+Tab shortcut to toggle composer plan mode (pingdotgg#186)

- add Shift+Tab keyboard handling in composer to switch chat/plan modes
- refactor mode toggle into shared callback used by hotkey and button
- add browser test to verify toggling only works when composer is focused

Prefer base HTML icon for .html files

- Override `.html` language mapping to use the generic HTML icon
- Add test coverage asserting `index.html` resolves to `file_type_html.svg`

repo too

Fix CLI publish using stale package.json version

The publish_cli job was checking out the default ref instead of the
preflight commit, so it published with the pre-bump version. Add the
correct ref to checkout and a --app-version flag as a safety override.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

chore(release): prepare v0.0.0-alpha.18

Co-authored-by: codex <[email protected]>

Fix electron-updater auth for private GitHub repos

Use setFeedURL with private: true when a GitHub token is provided so
electron-updater queries the GitHub API instead of the public Atom feed
which rejects Bearer auth headers.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

chore(release): prepare v0.0.0-alpha.16

Co-authored-by: codex <[email protected]>

chore(release): prepare v0.0.0-alpha.15

Co-authored-by: codex <[email protected]>