Update AGENTS.md. Start fixing old weird errors

packages/backend/convex/schema.ts

@@ -18,11 +18,9 @@ const applicationTables = {
     phoneVerificationTime: v.optional(v.number()),
     isAnonymous: v.optional(v.boolean()),
     /* Fields below here are custom & not defined in authTables */
-    themePreference: v.optional(v.union(
-      v.literal('light'),
-      v.literal('dark'),
-      v.literal('system'),
-    )),
+    themePreference: v.optional(
+      v.union(v.literal('light'), v.literal('dark'), v.literal('system')),
+    ),
   })
     .index('email', ['email'])
     .index('phone', ['phone'])