Agent sessions view changes feedback

[bpasero]

Regressions from #293523 that I noticed:

Actions in sections no longer align with sessions

Screen.Recording.2026-02-07.at.09.03.57.mov

Focus outline indication inconsistent with the rest of the UI

I like the idea of revisiting focus outline but at least as long as the sessions view shows alongside other VS Code core controls, it now feels weirdly different behaving:

Screen.Recording.2026-02-07.at.09.07.01.mov

Should this be a general thing we do for lists/trees:

vscode/src/vs/workbench/contrib/chat/browser/agentSessions/agentSessionsControl.ts

Lines 179 to 185 in 0204a85

	// Track mouse vs keyboard focus to suppress focus outlines on mouse clicks
	this._register(addDisposableListener(this.sessionsContainer!, 'mousedown', () => {
	this.sessionsContainer!.classList.add('mouse-focused');
	}));
	this._register(addDisposableListener(this.sessionsContainer!, 'keydown', () => {
	this.sessionsContainer!.classList.remove('mouse-focused');
	}));

//cc @benibenj

Sessions overlap with scrollbar

Font seems small compared to the rest of the UI

I think we typically have a 13px font for reading list/tree contents through out the UI, but the sessions list goes below that, down to 11px, making the list look almost zoomed out compared to the rest.

[daviddossett]

Raised #293666 to address most of these:

• section/item action alignment
• Reverts focus outline to punt that to a follow up PR
• Font size to 13 for titles (for now)