Label new tags for creators + tag categories migration fix (#64)

* Add ability to see new tags since last update

* Fix some bugs and edge cases

* Add migration fix to appease ci

supabase/migrations/20260706161539_created_at_for_tags.sql

@@ -0,0 +1,18 @@
+-- All existing tags will have null created_at values
+-- but future tags will default to now()
+alter table "public"."tags"
+  add column "created_at" timestamp with time zone;
+alter table "public"."tags"
+  alter column "created_at" set default now();
+
+-- All existing hacks will use created_at for tags_updated_at
+-- but future hacks will default to now()
+alter table "public"."hacks"
+  add column "tags_updated_at" timestamp with time zone;
+update "public"."hacks"
+  set tags_updated_at = created_at
+  where tags_updated_at is null;
+alter table "public"."hacks"
+  alter column "tags_updated_at" set default now();
+alter table "public"."hacks"
+  alter column "tags_updated_at" set not null;

supabase/migrations/20260710052853_fix_bad_tag_category_change.sql

@@ -0,0 +1,11 @@
+DO $$ BEGIN
+  IF EXISTS (
+    SELECT 1
+    FROM pg_enum e
+    JOIN pg_type t ON e.enumtypid = t.oid
+    WHERE t.typname = 'Tag Categories'
+      AND e.enumlabel = 'Sprites'
+  ) THEN
+    ALTER TYPE public."Tag Categories" RENAME VALUE 'Sprites' TO 'Graphics';
+  END IF;
+END $$;