Standardize settings and add native macOS settings window

[austin-smith]

What Changed

• Reorganized the settings page into Appearance, Sound & Haptics, Gameplay, Help, and About sections. The Appearance rows (Table, Cards, App Icon) drill into focused pages and show the current selection as a trailing preview.
• Added three settings: Haptic feedback (iOS), Show game stats, and Show stock count — all default-on. Haptics are gated centrally in HapticManager, the stats strip hides as a whole (including Golf's Match tile), and stock counts hide in both stock presentations while accessibility values keep reporting exact counts.
• Replaced the macOS settings sheet with a native Settings scene: General, Appearance, Rules, and About panes with fitted sizes, so ⌘, opens the standard settings window and pane switches get the system's animated resize.
• Settings rows are shared between the iOS sheet and the macOS panes (SoundSettingsRows, GameplaySettingsRows, TableSettingsRows, CardsSettingsRows).
• Rules & Scoring gained a game picker — it defaults to the game in play but any variant's rules, scoring, and terms can be browsed from anywhere, which the settings window made necessary.
• Navigation cleanups: Rules & Scoring and the app icon picker are pushes inside the iOS settings stack instead of stacked sheets; About appears in settings on both platforms; the About copy wraps at the About window's column width in any host.

Why

The settings page had grown into a flat list with uneven sections, nested sheets, and no macOS-native behavior — resizing the sheet on every navigation with no animation. This restructures it around standard platform patterns and adds the three requested visibility/feedback settings (#54, #55, #57).

Validation

• Full unit suite via the AGENTS.md test workflow: 541 tests, 0 failures, 10 skipped.
• Debug builds green for iOS Simulator and macOS destinations after each change.
• Manually exercised on iPhone 17 Pro simulator and macOS: settings navigation, all new toggles (stats strip, stock count, hint button), settings window panes, rules game picker, and About wrapping.

UI Changes

• iOS: settings top level now shows Appearance rows with live previews (color swatch, card style thumbnail, app icon) and grouped toggle sections with subtitles.
• macOS: settings open in the standard settings window with toolbar panes instead of a sheet; background color swatches are fixed at 32pt; Rules & Scoring header is a single left-aligned cluster.

Closes #54, closes #55, closes #57.