fix(db): qualify cross-function calls in search migration (#66)

Both page_search_vector and search_pages call extract_text_from_lexical
without schema qualification. With set search_path = '' (empty), PostgreSQL
cannot resolve the function, causing every Deploy Migrations run to fail
since PR #53 was merged.

Prefix calls with public. so they resolve under an empty search path.

Co-authored-by: Ona <no-reply@ona.com>

Author: zacharias-ona

supabase/migrations/20260415111351_add_page_search_vector.sql

@@ -60,7 +60,7 @@ as $$
 begin
   return (
     setweight(to_tsvector('english', coalesce(title, '')), 'A') ||
-    setweight(to_tsvector('english', coalesce(extract_text_from_lexical(content), '')), 'B')
+    setweight(to_tsvector('english', coalesce(public.extract_text_from_lexical(content), '')), 'B')
   );
 end;
 $$;
@@ -132,7 +132,7 @@ begin
       p.icon,
       ts_headline(
         'english',
-        coalesce(p.title, '') || ' ' || coalesce(extract_text_from_lexical(p.content), ''),
+        coalesce(p.title, '') || ' ' || coalesce(public.extract_text_from_lexical(p.content), ''),
         tsquery_val,
         'StartSel=<<, StopSel=>>, MaxWords=35, MinWords=15, MaxFragments=1'
       ) as snippet,