[VS Code] Fast mode lightning icon changed from outline to filled — visual regression; please restore the outline/hollow Fast mode lightning icon, or provide an option to use it

What version of the IDE extension are you using?

26.901.22334

What subscription do you have?

Pro 20x

Which IDE are you using?

VS Code

What platform is your computer?

Linux 7.0.0-30-generic x86_64 x86_64

What issue are you seeing?

The Fast mode lightning icon in the Codex VS Code extension appears to have changed from the previous outline/hollow lightning bolt to a solid filled bolt.

This is only a visual/UI issue/regression, but the new filled icon has significantly more visual weight at this small size. In the collapsed model selector it looks more like a dark blob than a lightweight status indicator especially in light themes, which is, frankly speaking, very unpleasant to look at. The new filled icon draws considerably more attention than the model name and reasoning-effort text next to it.

What steps can reproduce the bug?

1. Enable Fast mode.
2. Look at the lightning icon displayed next to the selected model / reasoning level.
3. Observe that the lightning bolt is now rendered as a solid/filled shape instead of the previous outline/hollow icon.

What is the expected behavior?

Please restore the previous outline/hollow lightning icon.

If the filled icon is an intentional design change, an alternative would be to provide an appearance option to use the previous outline icon.

Additional information

I would prefer not to work around this by installing an older Codex extension, since current versions are required for newer functionality/models such as GPT-6 Astra.

If restoring the old icon globally is undesirable, an appearance/theme option for the Fast mode indicator would solve the problem without changing the default for other users.

Start in the VS Code extension's Fast-mode selector and trace where the lightning icon is selected or rendered. Compare the current filled icon with the outline version shown in the issue, then verify the Fast-mode indicator in light and dark themes and confirm that its visual weight matches the expected hollow appearance.