fix(db): handle all migration edge cases for show_program_content column

Improve migration idempotency by handling four scenarios:
1. Both columns exist: backfill and drop old column
2. Only old column exists: rename to new column
3. Neither column exists: add new column
4. Only new column exists: no action needed

Co-authored-by: Bill Chirico <undefined@users.noreply.github.com>

Author: github-actions[bot]

supabase/migrations/20260124000006_rename_show_program_content.sql

@@ -3,34 +3,57 @@
 
   Adds the show_program_content column to control Program tab visibility.
 
-  This migration handles two scenarios:
-  1. Fresh database: adds show_program_content column directly
-  2. Existing database with show_twelve_step_content: renames the column
+  This migration handles four scenarios:
+  1. Both columns exist: backfill new from old, then drop old column
+  2. Only old column exists: rename old to new column
+  3. Neither column exists: add new column with default
+  4. Only new column exists: no action needed (already migrated)
 */
 
 DO $$
 BEGIN
-  -- Check if the old column exists (existing database)
+  -- Case 1: Both columns exist (partial migration or manual addition)
+  -- Backfill new column from old and drop old column
   IF EXISTS (
     SELECT 1 FROM information_schema.columns
     WHERE table_schema = 'public'
     AND table_name = 'profiles'
     AND column_name = 'show_twelve_step_content'
+  ) AND EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'public'
+    AND table_name = 'profiles'
+    AND column_name = 'show_program_content'
+  ) THEN
+    -- Backfill any NULL values in new column from old column
+    UPDATE public.profiles
+      SET show_program_content = show_twelve_step_content
+      WHERE show_program_content IS NULL AND show_twelve_step_content IS NOT NULL;
+    -- Drop the old column
+    ALTER TABLE public.profiles
+      DROP COLUMN show_twelve_step_content;
+  -- Case 2: Only old column exists (existing database)
+  -- Rename old column to new
+  ELSIF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = 'public'
+    AND table_name = 'profiles'
+    AND column_name = 'show_twelve_step_content'
   ) THEN
-    -- Rename existing column
     ALTER TABLE public.profiles
       RENAME COLUMN show_twelve_step_content TO show_program_content;
-  -- Check if neither column exists (fresh database)
+  -- Case 3: Neither column exists (fresh database)
+  -- Add new column
   ELSIF NOT EXISTS (
     SELECT 1 FROM information_schema.columns
     WHERE table_schema = 'public'
     AND table_name = 'profiles'
     AND column_name = 'show_program_content'
   ) THEN
-    -- Add new column
     ALTER TABLE public.profiles
       ADD COLUMN show_program_content BOOLEAN DEFAULT true;
   END IF;
+  -- Case 4: Only new column exists - no action needed (migration already complete)
 END $$;
 
 COMMENT ON COLUMN public.profiles.show_program_content IS