chore(dependencies): update multiple dependencies to latest versions (#301)

- Upgraded `@supabase/supabase-js` to `2.51.0`
- Bumped `@tanstack/react-query` to `5.83.0`
- Incremented `next` and related packages to `15.4.1`
- Miscellaneous upgrades including `@react-email/components`, `eslint`, and `cssnano`.

packages/billing/lemon-squeezy/package.json

@@ -25,7 +25,7 @@
     "@kit/tsconfig": "workspace:*",
     "@kit/ui": "workspace:*",
     "@types/react": "19.1.8",
-    "next": "15.3.5",
+    "next": "15.4.1",
     "react": "19.1.0",
     "zod": "^3.25.74"
   },