Add reusable Dialog component using Radix UI

Implemented a Dialog component with Radix UI's primitives for a customizable and accessible modal experience. Updated dependencies to include `@radix-ui/react-dialog` and structured the component for extensibility and reuse.

frontend/package.json

@@ -16,6 +16,7 @@
     "@hey-api/client-axios": "^0.6.2",
     "@hey-api/client-fetch": "^0.8.3",
     "@radix-ui/react-alert-dialog": "^1.1.6",
+    "@radix-ui/react-dialog": "^1.1.6",
     "@radix-ui/react-label": "^2.1.2",
     "@radix-ui/react-popover": "^1.1.6",
     "@radix-ui/react-progress": "^1.1.2",