feat(icons): extract shared workspace icon package

Create @workspace/icons as the single Hugeicons-backed Icon primitive and icon-data export surface, with size presets and inherited current color.

Migrate blocks and the web app to the shared package, remove duplicated direct Hugeicons dependencies and the blocks-local Icon component, and update the lockfile.

packages/icons/tsconfig.json

@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "react-jsx",
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "paths": {
+      "@workspace/icons": ["./src/index.tsx"]
+    }
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist"]
+}