Expand Apple platform integrations and OLED polish

[zachyzissou]

Problem

The app has a strong OLED/Tuner direction and should make deeper use of Apple platform affordances where they reinforce the product.

Candidate work

• Dynamic Island/Live Activity refinements for playback state.
• Haptics for key Tuner actions.
• OLED-safe black surfaces and contrast review.
• Shortcuts/App Intents for common playback/library actions.
• Widget/Now Playing polish.

Acceptance criteria

• Pick the highest-impact integrations and implement behind clear product use cases.
• Do not add platform features as decoration.
• Verify battery/contrast/accessibility impact.
• Document what shipped and what remains.

Agent execution contract

Readiness: agent:senior-required
Lane: Apple integrations / OLED polish

Start in these files:

• OffScript/OffScriptAppIntents.swift
• OffScript/NowPlayingActivityAttributes.swift
• OffScript/NowPlayingPublisher.swift
• OffScriptWidgets/*
• OffScript/AppTheme.swift

Required verification:

• Real-device or TestFlight checklist for platform features.
• Unit/UI tests where simulator behavior is representative.

Non-goals / guardrails:

• Do not add Apple features as decoration.
• Do not change entitlements/signing without explicit preflight.

PR expectation: Senior product/platform PR with real-device proof.

Low-thinking agents must follow docs/AGENT_EXECUTION_RUNBOOK.md. If the touched code falls outside the files above, stop and tighten the issue or ask for senior review before continuing.