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/database-webhooks/package.json

@@ -22,7 +22,7 @@
     "@kit/supabase": "workspace:*",
     "@kit/team-accounts": "workspace:*",
     "@kit/tsconfig": "workspace:*",
-    "@supabase/supabase-js": "2.50.5",
+    "@supabase/supabase-js": "2.51.0",
     "zod": "^3.25.74"
   },
   "typesVersions": {