fix(tests): resolve 4 failing tests across cli and dashboard packages

- task.test.ts: save/delete GITHUB_REPOSITORY env before
  runTaskPrCreate fallback test so CI env doesn't bypass the
  getCurrentRepo code path
- app.test.tsx: increase waitForFrameContains timeout for ASCII QR
  render from 3s to 6s to accommodate slower CI environments
- remote-auth.test.ts: switch createRemoteSettings default from
  tailscale to cloudflare with a static ingressUrl so
  resolveRemoteBaseUrl doesn't 409 when no tunnel is running

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/cli/src/commands/dashboard-tui/__tests__/app.test.tsx

@@ -560,7 +560,7 @@ describe("Settings view", () => {
     stdin.write("\u001B[C");
     await new Promise((r) => setTimeout(r, 20));
     stdin.write("K");
-    await waitForFrameContains(lastFrame, "▀▀▀ASCII-QR▀▀▀");
+    await waitForFrameContains(lastFrame, "▀▀▀ASCII-QR▀▀▀", 6000);
     unmount();
   });
 });