Implement foundational vault data models, service, and shared UI components.

package.json

@@ -30,9 +30,12 @@
     "@eslint/js": "^10.0.1",
     "@tauri-apps/cli": "^2.10.1",
     "angular-eslint": "21.3.1",
+    "autoprefixer": "^10.4.27",
     "eslint": "^10.0.3",
     "jsdom": "^28.0.0",
+    "postcss": "^8.5.8",
     "prettier": "^3.8.1",
+    "tailwindcss": "^4.2.2",
     "typescript": "~5.9.2",
     "typescript-eslint": "8.56.1",
     "vitest": "^4.0.8"