Expose render scale and post-stage toggles in the Graphics settings tab

[Noisemaker111]

Refs #1688 (task 5, graphics part). Every game's built-in Graphics tab now exposes render scale and the four post stages next to the quality tier, resolved onto the GraphicsProfile the shell already renders with.

• packages/core/src/settings/graphicsSettings.ts (new): readGraphicsSettings(store, overrides) resolves tier + stored render scale / stage toggles into a GraphicsProfile; applyGraphicsQuality writes a tier and re-applies its defaults; GRAPHICS_POST_STAGES, labels, RENDER_SCALE_* bounds. Tests in graphicsSettings.test.ts.
• packages/core/src/settings/settingsModel.ts: SETTING_IDS gains graphics.renderScale and graphics.post.{ao,bloom,dof,smaa}.
• packages/shell/src/settings/appliedSettings.tsx: useGraphicsSettings reads through readGraphicsSettings, so the canvas dpr and PostProcessing stages follow the player's choices.
• packages/shell/src/settings/settingsController.ts: Graphics rows are Quality, Render scale, Shadows, AO, Bloom, DoF, SMAA, UI scale; takes the game's graphics overrides so tier defaults match what renders (Shell3dPresentation.tsx passes playable.graphics).
• scripts/drive-dev.ts: --click also matches aria-label for icon-only buttons and prefers the interactive element on a tie, so the stock SettingsTrigger and toggle switches are drivable.
• CHANGELOG Unreleased, bun run gen.

Verification: bun --cwd=packages/core run check-types / test pass (5642 tests); bun --cwd=packages/shell run check-types / test pass (485 tests); check-stateful-ratchet, check-doc-symbols, check-orphan-ratchet, check-changelog, check-hud-tokens, gen all ok.

Graphics tab before / after (bun run drive wreckway --mode play --click Settings --click Graphics --shot ...):

Toggle tried in play: bloom on (default) vs bloom switched off through the menu — the glow on the distant lights and headlights goes away.

Still open on #1688 task 5: frame cap, fullscreen, accessibility and language categories.

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