feat: protect responsive board layouts

packages/db/migrations/sqlite/0042_add_layout_role.sql

@@ -0,0 +1 @@
+ALTER TABLE `layout` ADD `role` text DEFAULT 'custom' NOT NULL;

packages/db/migrations/sqlite/meta/_journal.json

@@ -309,6 +309,13 @@
       "when": 1786212459480,
       "tag": "0043_add_layout_gutters",
       "breakpoints": true
+    },
+    {
+      "idx": 44,
+      "version": "6",
+      "when": 1786215203092,
+      "tag": "0044_add_layout_role",
+      "breakpoints": true
     }
   ]
 }