feat(connection): preserve failed one-time connections

apps/desktop/src/components/connection/ConnectionDialog.vue

@@ -5190,7 +5190,8 @@ async function save() {
         .catch((e: any) => {
           const message = String(e?.message || e);
           if (message.includes(CONNECTION_ATTEMPT_CANCELLED_MESSAGE)) return;
-          if (config.one_time) void store.removeConnection(config.id);
+          // Keep failed one-time connections available for retry and error inspection.
+          // They are still removed by connectionStore.disconnect after a successful session.
           emit("connectFailed", appendConnectionErrorHints(config, mongodbAuthFailureHint(message), t));
         });
       return;

apps/desktop/src/lib/__tests__/connection/connectionDialog.deepLinkServices.spec.ts

@@ -31,4 +31,13 @@ describe("ConnectionDialog service deep-link hydration", () => {
     expect(applyBody).toContain("parseConnectionDeepLink(input) ?? parseServiceConnectionUrl(input)");
     expect(applyBody.indexOf("applyConnectionDraftToForm")).toBeLessThan(applyBody.indexOf("parseConnectionUrl(input"));
   });
+
+  it("keeps failed one-time connections available for error inspection and retry", () => {
+    const saveStart = source.indexOf("async function save()");
+    const saveEnd = source.indexOf('const dialogTitle = ref("")', saveStart);
+    const saveBody = source.slice(saveStart, saveEnd);
+
+    expect(saveBody).not.toContain("store.removeConnection(config.id)");
+    expect(saveBody).toContain('emit("connectFailed"');
+  });
 });