[codex] Refresh Foundation Lab UI and UX

[rudrankriyam]

What changed

• Reworked Library, Playground, and Runs around native adaptive navigation and list hierarchy.
• Made Playground content-first, moved advanced controls into an on-demand inspector, and clarified transcript, tool, and token states.
• Refined run evidence, Adapter Comparison, FMFBench, guided labs, dynamic schemas, language examples, document Q&A, and Xcode 27 learning surfaces.
• Rewrote user-facing copy across the app, including replacing export phrasing with clear Generate Swift Code actions.
• Simplified Health to present authorized HealthKit data plainly without synthetic scores, goals, or interpretations.
• Standardized layout metrics, touch targets, empty states, confirmations, errors, and accessible control sizing.
• Refreshed Localizable and App Shortcuts catalogs across all ten supported locales.

Why

Foundation Lab should feel quiet, precise, and familiar to people using Apple developer tools. These changes reduce visual and cognitive noise, make the primary experiment flow easier to follow, and keep advanced capabilities available through progressive disclosure.

Validation

• swiftlint lint --strict --config .swiftlint.yml
• Xcode 26.6: swift test — 251 tests passed
• Xcode 26.6: iOS Simulator and macOS app builds
• Xcode 27 beta 2: iOS Simulator and macOS app builds
• String catalog compilation for all ten supported locales
• Localization coverage, stale-entry, and placeholder-parity audits
• Visual QA on iPhone and iPad in light mode, dark mode, and accessibility text sizes

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