feat(web): in-app Gemini pattern generation in Pattern Lab (BYOK PoC)

Replace the copy-paste prompt loop with in-app generation via the Gemini
API (gemini-3.5-flash, generateContent + structured output). Bring-your-own
key, stored only in localStorage and sent directly to Google — no server
proxy, no bundled key. PostHog session replay redacts the API host and the
key field is type=password + ph-no-capture.

Pattern Lab gallery:
- Code | Gallery tab toggle in the right panel; tab-specific header actions.
- Parallel job queue (live status + elapsed timer), accumulating gallery,
  count (1-20), thinking level, orientation, and reference-count controls.
- Click a card to load it; Select mode for pin (keep at top) / delete; a
  random sample of presets is fed as references to widen variety.
- Generated patterns auto-stamped with an editable CC-BY-SA license header
  + footer attributing patternflow.work/pattern-lab.

Runtime hardening for AI-generated code (both PatternRuntime and the 3D
LedMatrixTexture): tolerate the setPixel(x, y, [r,g,b]) array form and
mirror knob/button state onto params so params.knobValues works in draw().

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: engmung

web/package-lock.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@chenglou/pretext": "^0.0.6",
+    "@google/genai": "^2.9.0",
     "@mdx-js/loader": "^3.1.1",
     "@mdx-js/react": "^3.1.1",
     "@monaco-editor/react": "^4.7.0",