sessions: rename "No Workspace" group to "Unknown"

[sandy081]

Summary

Renames the fallback workspace group label in the sessions list from "No Workspace" to "Unknown" for sessions that don't have an associated workspace.

Changes

• src/vs/sessions/contrib/sessions/browser/views/sessionsList.ts — Updated groupByWorkspace() fallback label from "No Workspace" to "Unknown"
• src/vs/sessions/contrib/sessions/test/browser/sessionsList.test.ts — Updated test description and assertion to match the new label

[Copilot]

Pull request overview

Renames the fallback workspace group label used by the Sessions list grouping logic when a session has no associated workspace, and updates the related unit test expectations.

Changes:

• Updated groupByWorkspace() fallback label from “No Workspace” to “Unknown”.
• Updated the groupByWorkspace helper test description and expected labels to match.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/vs/sessions/contrib/sessions/browser/views/sessionsList.ts	Changes the localized fallback workspace group label used during grouping.
src/vs/sessions/contrib/sessions/test/browser/sessionsList.test.ts	Updates test text and assertions for the new fallback label.

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/sessions/browser/views/sessionsList.ts:1186

• The fallback group label is now "Unknown", and groupByWorkspace uses the label both as the Map key and to form the section id (id: workspace:${label}). This increases the chance of collisions with a real workspace actually named "Unknown", which can break section identity and collapse-state persistence (two different groups end up sharing the same id). Consider using a stable, non-display identifier for grouping/ids (e.g. a dedicated sentinel id for the missing-workspace group) and keep the localized label purely for display.

		const workspace = session.workspace.get();
		const label = workspace?.label ?? localize('unknown', "Unknown");
		let group = groups.get(label);
		if (!group) {
			group = [];
			groups.set(label, group);
		}
		group.push(session);
	}

	const order = [...groups.keys()].sort((a, b) => a.localeCompare(b));

	return order.map(label => ({
		id: `workspace:${label}`,
		label,