Redesign top chrome and safe-area usage

[zachyzissou]

Problem

Extra top padding was added to dodge Dynamic Island/status bar issues, but the top of the app can use the screen better while staying safe around iOS chrome.

Acceptance criteria

• Review top spacing on Dynamic Island and non-Dynamic Island devices.
• Reduce wasted vertical space without overlapping time, Wi-Fi/cellular, or Dynamic Island.
• Keep Tuner header rhythm consistent across Home, Library, Search, Queue, Settings, and detail screens.
• Verify on multiple simulator sizes and include screenshots.

Notes

This is UI polish, not a reason to reintroduce system navigation chrome.

Agent execution contract

Readiness: agent:needs-spec
Lane: Tuner UI / Safe area

Start in these files:

• OffScript/AppTheme.swift
• OffScript/HomeView.swift
• OffScript/LibraryView.swift
• OffScript/SearchView.swift
• OffScript/QueueView.swift
• OffScript/EpisodeDetailView.swift

Required verification:

• xcodebuild test -project OffScript.xcodeproj -scheme OffScript -destination 'platform=iOS Simulator,OS=latest,name=iPhone 17 Pro' -only-testing:OffScriptTests CODE_SIGNING_ALLOWED=NO
• Simulator screenshots on Dynamic Island and non-Dynamic Island devices.

Non-goals / guardrails:

• Do not reintroduce empty root navigation bars.
• Do not overlap iOS status/Dynamic Island areas.

PR expectation: Needs a narrower surface/device spec before low-thinking implementation.

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.