ads: surface the Text Link size on the Monetize page (#98)

Add the native, full-width text-link ad to the publisher size picker.
Unlike the banners, text_link predates the ad_slots.formats default, so
a migration widens the default and backfills existing slots — otherwise
serveAd() would gate it out and the copied embed would never fill.

- lib/ads/formats.ts: add text_link to PUBLISHER_FORMAT_IDS
- supabase/migrations: allow text_link on ad_slots.formats (+ backfill)

Note: prod migration history has diverged, so this must be applied by
hand via psql over the pooler (see the crawlproof-alerts runbook), not
`supabase db push`.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: ralyodio

lib/ads/formats.ts

@@ -23,6 +23,7 @@ export const PUBLISHER_FORMAT_IDS: AdFormatId[] = [
   "banner_300x250",
   "banner_728x90",
   "banner_320x50",
+  "text_link",
 ];
 
 export function formatSpec(id: AdFormatId) {

supabase/migrations/20260717130000_ad_slot_text_link_format.sql

@@ -0,0 +1,16 @@
+-- Allow the native text-link ad to serve on publisher slots.
+--
+-- ad_slots.formats gates which sizes serveAd() will fill for a slot, and its
+-- original default predates the text_link format:
+--   default array['banner_300x250','banner_728x90','banner_320x50']
+-- So a publisher who copies the new text-link embed would get nothing back.
+-- Widen the default for new slots and backfill existing ones so their
+-- text-link embed actually fills.
+
+alter table public.ad_slots
+  alter column formats
+  set default array['banner_300x250', 'banner_728x90', 'banner_320x50', 'text_link'];
+
+update public.ad_slots
+  set formats = array_append(formats, 'text_link')
+  where not ('text_link' = any (formats));