ci(mobile): distribute stores from main releases

[sjungwon03]

Summary

Moves App Store Connect and Google Play distribution behind the existing version-gated main release workflow. Store distribution now runs only for a new version, after release verification and desktop packaging.

Closes #192

Validation

• npm test -- tests/releaseWorkflow.test.ts
• Workflow YAML parsed for all three workflows.
• git diff --check passed.
• npm run typecheck (CI pending)
• npm test (CI pending)
• npm run build (CI pending)

Checklist

• This pull request targets dev.
• I created or linked a GitHub issue for this change.
• I used a Conventional Commit message.
• I added workflow regression coverage.
• I updated release documentation.
• I did not include secrets, private media, private file paths, credentials, or security exploit material.

Notes for reviewers

The Android release is production/completed only after an unreleased version reaches main. The iOS job uploads the build to App Store Connect; App Review submission remains explicit in App Store Connect.

[sjungwon03-ai]

The PR updates CI workflows to gate mobile store distribution (App Store Connect, Google Play) behind the main release workflow. Changes are minimal, well-tested, and include documentation updates. No code-quality issues; the verify check passed.