fix(calendar-lab): rewrite zoom as GSAP flying-rect with proper async sequencing

- Replace panzoom + timeline approach with clean async/await GSAP tweens
- Flying rect morphs from cell position to full viewport (aspect ratio change)
- Fix zoomOut race condition: nested gsap.to inside tl.call fired outside timeline
- Fix opacity conflict: GSAP controls all opacity, CSS class only for pointer-events
- Fix gridLayerRef losing reference on :key remount during resize
- Make viewport dimensions reactive via ResizeObserver (vpWidth/vpHeight refs)
- Wait for fade-in completion before unlocking isAnimating

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

frontend/package-lock.json

@@ -30,6 +30,7 @@
         "daisyui": "^5.5.18",
         "graphql": "^16.12.0",
         "graphql-tag": "^2.12.6",
+        "gsap": "^3.14.2",
         "ioredis": "^5.7.0",
         "langfuse": "^3.38.6",
         "langsmith": "^0.5.4",
@@ -15131,6 +15132,12 @@
         }
       }
     },
+    "node_modules/gsap": {
+      "version": "3.14.2",
+      "resolved": "https://registry.npmjs.org/gsap/-/gsap-3.14.2.tgz",
+      "integrity": "sha512-P8/mMxVLU7o4+55+1TCnQrPmgjPKnwkzkXOK1asnR9Jg2lna4tEY5qBJjMmAaOBDDZWtlRjBXjLa0w53G/uBLA==",
+      "license": "Standard 'no charge' license: https://gsap.com/standard-license."
+    },
     "node_modules/guid-typescript": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/guid-typescript/-/guid-typescript-1.0.9.tgz",