[codex] Refine Foundation Lab macOS workspace UX

[rudrankriyam]

Summary

• increase the macOS default window to keep the Playground canvas generous with its configuration inspector open
• add native Sidebar and Inspector commands plus a localized Navigate menu for Library, Playground, and Runs
• restore the selected destination, sidebar and inspector visibility, user-resized split widths, and each expert workspace phase across launches
• make Adapter Comparison and FMFBench read as explicit five-phase workflows with contextual, truthful status rails
• localize the new navigation and phase copy across all ten supported languages

User impact

Foundation Lab now behaves more like a native Apple developer tool on Mac: key panels are discoverable from the menu bar, the Playground remains the visual center, window state survives relaunches, and expert workspaces communicate both the current phase and actual activity without decorative chrome or invented progress.

Validation

• swiftlint lint --strict --config .swiftlint.yml
• swift test with Xcode 26.6
• swift test with Xcode 27 beta 2 (four runtime-gated modern error tests skipped on the installed older Foundation Models runtime)
• macOS and iOS Simulator builds with Xcode 26.6
• macOS and iOS Simulator builds with Xcode 27 beta 2
• native macOS visual QA for menu commands, Playground inspector behavior, expert phase/status presentation, and state restoration after quit and relaunch

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