feat(29-01): generate migration for image presentation fields

Migration adds dominant_color, crop_zoom, crop_x, crop_y to items,
global_items, and thread_candidates. Run db:push to apply.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

drizzle-pg/meta/_journal.json

@@ -29,6 +29,13 @@
       "when": 1775811339957,
       "tag": "0003_loving_serpent_society",
       "breakpoints": true
+    },
+    {
+      "idx": 4,
+      "version": "7",
+      "when": 1776016552627,
+      "tag": "0004_smiling_night_nurse",
+      "breakpoints": true
     }
   ]
 }