Chat history state desync after background refresh

Environment

• Browser: Zen Browser (Pinned Tab)

• OS: macOS (M2)

Steps to Reproduce

1. Keep t3.chat as a pinned tab.

2. Leave the tab in the background until it auto-refreshes upon being selected again.

3. Issue 1: The left sidebar history is completely empty.

4. Start a new chat.

5. Issue 2: The new chat is added to the sidebar but hangs on a "loading" state indefinitely.

6. Manually refresh the page.

Actual Result
After the manual refresh, the current chat is gone, the chat history returns, but the state is corrupted: the most recent previous chat is open, while the sidebar highlight/label displays the summary of the "lost" chat session.