feat(settings): display app version and commit hash in footer

[owieth]

Summary

• Add version + commit hash display to Settings footer (e.g. v1.7.13 (ee59f))
• Add CommitHash key to Info.plist, injected by CI from git rev-parse --short=5 HEAD
• Local/debug builds show v1.0 (dev), release builds show real version and commit

Closes #232

Test plan

• Open Settings → verify footer shows version and commit info
• Trigger a release build → verify CI injects correct version, build number, and commit hash

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