Remember the last used model and permission mode for new threads

[alexandergorka]

Problem

When starting a new thread, T3Code currently resets the selection to:

• Full Access as the permission mode
• The default/best model for the selected provider

If you usually work with a different permission mode or model, you have to select them again for every new thread.

Idea

It would be nice if T3Code could simply remember the last used model and permission mode and preselect them when creating the next thread.

For example:

1. Start a thread with a specific model and permission mode.
2. Create a new thread.
3. The previously used model and permission mode are already selected.

Changing either value would update what is used for the next new thread.

If there is no previous selection yet, T3Code could just fall back to the current defaults.

This would avoid adding additional settings while making new threads remember the user's preferred workflow.

[juliusmarminge]

Duplicate of #6508 — same request to remember last-used model and permission/working mode when starting a new thread. Please follow / add detail there.