WebChat side threads omitted selected_provider and selected_model from their requests, so replies used the backend default even when a different model was selected in the main chat.

Modifications

Pass the existing provider-selection getter to ThreadPanel and read it for every send. Side threads now use the main composer's current provider and model, including changes made after opening the panel.

• This is not a breaking change.

Verification Steps and Test Results

• pnpm typecheck passed.
• Executed the component's send() function with a mocked transport: verified the selected provider/model, a changed selection on the next send, and empty selections preserving backend defaults. All three checks passed.
• ruff format . and ruff check . passed.
• git diff --check passed.

Checklist

• Changes have been verified as described above.
• No new dependencies are introduced.
• Changes do not introduce malicious code.

Summary by Sourcery

Bug Fixes:

• Ensure WebChat side-thread replies use the provider and model currently selected in the main chat instead of falling back to backend defaults.