fix: add cascade delete for card-related foreign keys and invalidate … (#31)

* fix: add cascade delete for card-related foreign keys and invalidate workspace cache after deletion

* fix: use refetch instead of invalidate for workspace deletion to ensure immediate UI update

* feat: add cascade delete to card relations and activity tables

packages/db/migrations/meta/_journal.json

@@ -22,6 +22,13 @@
       "when": 1748378293342,
       "tag": "20250527203813_AddDeletedAtToLabel",
       "breakpoints": true
+    },
+    {
+      "idx": 3,
+      "version": "7",
+      "when": 1749118315675,
+      "tag": "20250605101155_AddCascadeDeleteToCardRelations",
+      "breakpoints": true
     }
   ]
 }