feat: add image crop modal to space icon picker

Wire react-easy-crop into CreateSpace so users can crop and zoom before
uploading a space icon. Adds reusable ImageCropModal component and
canvas crop utility for future use in space settings and avatar editing.

packages/web/package.json

@@ -9,13 +9,14 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@livekit/components-react": "^2.7.4",
     "@backspace/shared": "workspace:*",
+    "@livekit/components-react": "^2.7.4",
     "@sapphi-red/web-noise-suppressor": "^0.3.5",
     "livekit-client": "^2.9.0",
     "prism-react-renderer": "^2.4.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
+    "react-easy-crop": "^5.5.6",
     "react-markdown": "^9.0.1",
     "react-router-dom": "^6.28.0",
     "remark-gfm": "^4.0.1",