feat: add YouTube social link to user profiles (#114)

* feat: add YouTube social link to user profiles

- Add youtube_url column to auth_users schema
- Add DB migration for the new column
- Update updateProfile action with YouTube URL validation
- Update getUserProfile and getPublicProfile to include youtubeUrl
- Add YouTube input field to settings page
- Display YouTube icon on public profile pages

* fix: use drizzle-kit generate for youtube_url migration

Replaces manually created migration with proper drizzle-kit generated
migration that includes meta snapshot and journal entry.

---------

Co-authored-by: Anton Pascal <anton-pascal@users.noreply.github.com>

supabase/migrations/20260224053553_stormy_carnage.sql

@@ -0,0 +1 @@
+ALTER TABLE "auth_users" ADD COLUMN "youtube_url" text;

supabase/migrations/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1771536409437,
       "tag": "20260219212649_young_dragon_man",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1771911353115,
+      "tag": "20260224053553_stormy_carnage",
+      "breakpoints": true
     }
   ]
 }