Fix game picker outside-tap dismissal on iOS

[austin-smith]

Summary

On iOS, tapping outside the game picker panel often failed to dismiss it, even though the scrim is wired as the picker's cancel button. Two layered causes:

• The scrim's tappable area stopped at the safe-area insets. ignoresSafeArea() was applied to the Color inside the button's label, which paints edge to edge but leaves the button's hit region inset — taps in the top and bottom strips hit nothing. Moving the modifier onto the button itself makes the hit area truly full-screen.
• The bottom toolbar is UIKit chrome layered above the SwiftUI overlay. While the picker was open, the More/Hint/Undo pills stayed undimmed and fully tappable (the More menu could open on top of the "modal" picker), and the bar swallowed scrim taps across the whole bottom strip. The bottom-bar items now leave while the picker is open and return when it closes. .toolbar(.hidden, for: .bottomBar) is inert here because no NavigationStack hosts the bar, so the items are conditionally removed instead.

With the bar gone while the picker is up, the panel also gains enough height that all nine games fit without the scrolling fallback on current iPhones.

macOS is unaffected: the toolbar change is iOS-gated and the scrim change is a no-op without safe-area insets.

Testing

• New testTapOutsideDismissesGamePicker (iOS) covers the bottom-strip tap — the previously dead zone — and asserts the toolbar leaves while the picker is open and returns after dismissal.
• Existing macOS picker suite (Escape dismissal, accessibility modality, short-window scrolling) passes.
• Verified by hand in the iPhone 17 Pro simulator: all previously dead regions dismiss, variant sub-pages dismiss the same way, and game selection still switches correctly.

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