fix(mobile): restore iOS home screen branding

[PixPMusic]

Summary

• replace the generic native Threads title with a shared compact T3 Code lockup on iPhone and iPad
• include the compact ALPHA badge while preserving a plain-text T3 Code fallback
• retain heading semantics for assistive technologies

Before / After

Before	After

Verification

• verified the branded header in light and dark appearances on iPhone and iPad simulators
• vp check
• vp run typecheck
• vp run lint:mobile

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

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[macroscopeapp]

Approvability

Verdict: Approved

Purely visual UI change that adds a branded header component and updates navigation titles from 'Threads' to 'T3 Code'. No runtime behavior changes beyond visual presentation.

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