fix: respect clearWhenEmpty semantics for boolean fields

When clearWhenEmpty is 'omit' and a boolean field is set to false (the
default value), remove the key from the config blob instead of storing
it. This mirrors the string field behavior where clearing to empty
removes the key, and prevents the config from growing monotonically
once a switch is toggled.

Author: cursoragent

apps/web/src/components/settings/ProviderSettingsForm.tsx

@@ -109,7 +109,11 @@ export function nextProviderConfigWithFieldValue(
     config !== null && typeof config === "object" ? { ...(config as Record<string, unknown>) } : {};
 
   if (typeof value === "boolean") {
-    base[field.key] = value;
+    if (field.clearWhenEmpty === "omit" && value === false) {
+      delete base[field.key];
+    } else {
+      base[field.key] = value;
+    }
     return Object.keys(base).length > 0 ? base : undefined;
   }