ChatGPT Web thinking-level selector changed to a slider and is no longer detected

## Summary ChatGPT Web appears to have changed the thinking-level selector UI. Previously, the thinking level was selected from the older menu/dropdown interface. It is now displayed as a horizontal slider inside a popover, and Codex Web GPT no longer appears to recognize the selected thinking level correctly. In my case, ChatGPT Web is set to **High**, and the composer still displays `High` / `高い`, but the launcher does not correctly detect the setting after this UI change. ## Steps to reproduce 1. Open ChatGPT Web through Codex Web GPT. 2. Click the thinking-level control next to the message composer. 3. Observe that ChatGPT now displays a horizontal slider instead of the previous selection menu. 4. Set the thinking level to **High**. 5. Start or reconnect a Codex Web GPT session. ## Actual behavior Codex Web GPT does not correctly recognize the currently selected thinking level after the selector was changed to the new slider-based UI. ## Expected behavior Codex Web GPT should detect the selected thinking level from the new ChatGPT Web UI and continue to recognize values such as: - Instant - Medium - High - Extra High - Pro, where available ## Additional information The visible label next to the composer still shows `High` / `高い`, but the selector popover and its DOM structure appear to have changed. The current detection logic may still be looking for the previous dropdown or menu-item structure, so the selector parsing may need to be updated for the new slid...