Add sports-match type, device tracking, profile visits, and share refactor

- New SportsMatch model/controller and sports UI components/modal
- Move share-modal to a reusable x-share-modal/x-share-button component
- Add VideoSharedWithUser notification and share-to-members flow
- Device/user-agent tracking on views, downloads, share accesses
- ProfileVisit model + migration; subscription source tracking
- Email thumbnail support; remove stale TODO files

app/Models/User.php

@@ -205,7 +205,7 @@ class User extends Authenticatable implements MustVerifyEmail
             'user_subscriptions',
             'channel_id',
             'subscriber_id'
-        )->withPivot('created_at');
+        )->withPivot(['created_at', 'source_video_id']);
     }
 
     // Channels this user subscribes to
@@ -216,7 +216,7 @@ class User extends Authenticatable implements MustVerifyEmail
             'user_subscriptions',
             'subscriber_id',
             'channel_id'
-        )->withPivot('created_at');
+        )->withPivot(['created_at', 'source_video_id']);
     }
 
     public function isSubscribedTo(User $channel): bool