feat: add selection, crop, transform tools and supporting infrastructure for image editor

Implements Agent 2 deliverables for the image editor: move tool with Konva
Transformer and smart guide snapping, rectangular/elliptical marquee and
lasso selection with marching ants animation, magic wand flood fill, crop
tool with darkened overlay and rule-of-thirds grid, free transform with
numeric inputs, context menu with z-ordering and clipboard operations,
rulers with drag-to-create guides, smart alignment guides, and canvas/image
resize dialogs. Also creates the shared editor types and Zustand store with
full layer management, z-ordering, clipboard, guide, and document operations.

apps/web/package.json

@@ -12,25 +12,29 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
-    "@snapotter/shared": "workspace:*",
     "@dnd-kit/core": "^6.3.1",
     "@dnd-kit/sortable": "^10.0.0",
     "@dnd-kit/utilities": "^3.2.2",
     "@sentry/react": "^10.49.0",
+    "@snapotter/shared": "workspace:*",
     "@use-gesture/react": "^10.3.1",
     "clsx": "^2.1.0",
     "fflate": "^0.8.2",
     "jszip": "^3.10.1",
+    "konva": "^10",
     "leaflet": "^1.9.4",
     "lucide-react": "^0.469.0",
     "posthog-js": "^1.370.0",
     "qr-code-styling": "^1.9.2",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
+    "react-hotkeys-hook": "^5.3.2",
     "react-image-crop": "^11.0.10",
+    "react-konva": "^19",
     "react-router-dom": "^7.1.0",
     "sonner": "^2.0.7",
     "tailwind-merge": "^2.6.0",
+    "use-image": "^1.1.4",
     "zustand": "^5.0.0"
   },
   "devDependencies": {