refactor(frontend): restructure project layout and update API schema

Relocate frontend source code from `next-app/` to `frontend/` to align with the new project structure. This includes removing the old Next.js boilerplate files and establishing a cleaner workspace.

Additionally, updates the OpenAPI specification to include support for the `immich` widget type and its corresponding configuration schema.

- Move frontend files to `frontend/`
- Delete obsolete `next-app/` directory and its configuration
- Add `immich` widget type to `openapi.yaml`
- Update `FrontendPlan.md` with dashboard refactor and UX direction

frontend/package.json

@@ -0,0 +1,64 @@
+{
+  "name": "dash-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev --turbopack",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "typecheck": "tsc --noEmit",
+    "api:generate": "openapi-typescript ../openapi/openapi.yaml -o lib/api/schema.ts",
+    "test:e2e": "playwright test",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
+    "@radix-ui/react-collapsible": "^1.1.11",
+    "@radix-ui/react-dialog": "^1.1.14",
+    "@radix-ui/react-dropdown-menu": "^2.1.15",
+    "@radix-ui/react-label": "^2.1.7",
+    "@radix-ui/react-popover": "^1.1.14",
+    "@radix-ui/react-scroll-area": "^1.2.3",
+    "@radix-ui/react-select": "^2.2.5",
+    "@radix-ui/react-separator": "^1.1.7",
+    "@radix-ui/react-slot": "^1.2.3",
+    "@radix-ui/react-switch": "^1.2.5",
+    "@radix-ui/react-tabs": "^1.1.12",
+    "@radix-ui/react-tooltip": "^1.2.7",
+    "@tanstack/react-query": "^5.80.7",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "cmdk": "^1.1.1",
+    "lucide-react": "^0.511.0",
+    "next": "15.3.2",
+    "openapi-fetch": "^0.14.0",
+    "openapi-typescript": "^7.8.0",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "tailwind-merge": "^3.3.0",
+    "tailwindcss-animate": "^1.0.7"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "^3.3.5",
+    "@playwright/test": "^1.52.0",
+    "@tailwindcss/postcss": "^4.1.7",
+    "@types/node": "^22.15.0",
+    "@types/react": "^19.1.0",
+    "@types/react-dom": "^19.1.0",
+    "eslint": "9.39.4",
+    "eslint-config-next": "^15.3.2",
+    "msw": "^2.7.0",
+    "tailwindcss": "^4.1.7",
+    "typescript": "^5.8.3",
+    "vitest": "^3.1.0"
+  },
+  "msw": {
+    "workerDirectory": [
+      "public"
+    ]
+  }
+}