feat: migrate form builder to shadcn/ui + Huge Icons

- Replace @wordpress/components with shadcn Input, Button, Switch, Select, Textarea, Label
- Replace @wordpress/icons with @hugeicons/core-free-icons and @hugeicons/react
- Update fieldTypes config with Huge Icons component references
- Migrate FormFieldOptions, FieldSettingsPanel, FormField, FormCanvas, FieldPalette

package-lock.json

@@ -9,6 +9,7 @@
       "version": "2.0.0",
       "license": "GPL-2.0-or-later",
       "dependencies": {
+        "@hugeicons/core-free-icons": "^4.1.1",
         "@hugeicons/react": "^1.1.6",
         "@radix-ui/react-checkbox": "^1.3.3",
         "@radix-ui/react-dialog": "^1.1.15",
@@ -2413,6 +2414,12 @@
         "@hapi/hoek": "^9.0.0"
       }
     },
+    "node_modules/@hugeicons/core-free-icons": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@hugeicons/core-free-icons/-/core-free-icons-4.1.1.tgz",
+      "integrity": "sha512-teqIBvPHl90ygIwKyJwTxOH8aNp1X1PjDTcMvLkEwdPxPD+8mssrZ5kXKIAJJFYPsz69a8LYQY0UPid4PAdavg==",
+      "license": "MIT"
+    },
     "node_modules/@hugeicons/react": {
       "version": "1.1.6",
       "resolved": "https://registry.npmjs.org/@hugeicons/react/-/react-1.1.6.tgz",