fix(archive): atomic remove-kind path + split test modules (#1562)

Signed-off-by: Will Pfleger <pfleger.will@gmail.com>
Co-authored-by: npub1fgdl5qqnh3k3f2xkqrvt7cujalhm623x4s7fdjdj5yrtp5fzjl9qrjpucw <4a1bfa0013bc6d14a8d600d8bf6392efefbd2a26ac3c96c9b2a106b0d12297ca@sprout-oss.stage.blox.sqprod.co>

desktop/src/shared/api/tauriArchive.ts

@@ -126,6 +126,24 @@ export async function mergeSaveSubscriptionKinds(kind: number): Promise<void> {
   notifySubscriptionChange();
 }
 
+/**
+ * Atomically remove `kind` from the `owner_p` save subscription for the
+ * current identity + relay.
+ *
+ * Mirrors `mergeSaveSubscriptionKinds`: reads existing kinds, removes `kind`,
+ * then deletes the row if the list becomes empty or updates it otherwise.
+ * Uses `BEGIN IMMEDIATE` on the Rust side for the same reason as the merge
+ * path — concurrent toggle-OFF callers serialize rather than racing.
+ *
+ * Called by toggle-OFF handlers in `LocalArchiveSettingsCard` for both
+ * kind 24200 and kind 44200, replacing the former TS-side read-modify-overwrite
+ * that would drop the *other* kind if `subs` state was stale.
+ */
+export async function removeSaveSubscriptionKind(kind: number): Promise<void> {
+  await invokeTauri("remove_save_subscription_kind", { kind });
+  notifySubscriptionChange();
+}
+
 /**
  * Create a save subscription.
  * Runs an access probe on the backend (channel membership, event readability).