* feat(mobile): add commit failure recovery panel with AI fix action
- Surfaces a "Commit failed" panel with a one-tap AI fix button when a
git commit fails in the source control view or PR creation flow
- Detects commit failures specifically during the committing progress
step and captures staged entries and commit message for context
- Extracts commit failure summary and prompt logic into
`src/shared/source-control-commit-failure.ts` and PR checks prompt
into `src/shared/pr-checks-fix-prompt.ts` so both desktop and mobile
share the same implementations
- Adds auto-find of an available Metro port starting from 8081 and
extracts expo CLI bootstrap into `mobile-expo-cli.mjs` shared by
`start-emulator` and a new `start-expo.mjs` wrapper
* Share source-control AI prompts and simplify mobile PR actions
- Extract conflict, check-fixing, and commit-failure prompt builders
to shared modules for reuse by both desktop and mobile.
- Configure Metro in the mobile package to watch and bundle modules
from the repository-root shared directory.
- Remove the desktop-style merge method picker from the mobile PR
actions panel, opting to use repository defaults automatically.
- Refactor mobile hosted review creation and git preparation logic
into dedicated helper files.
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