improve sessions workspace picker

[sandy081]

No description provided.

[Copilot]

Pull request overview

This PR improves the Agent Sessions “workspace/worktree” picker and related sessions UI plumbing in vs/sessions, aiming to make workspace selection clearer and more consistent across providers and scenarios.

Changes:

• Enhances the sessions workspace picker UI: provider grouping, remove-from-recents, and provider-grouped “Select…” browse submenus.
• Adds section-level toolbar actions in the Sessions list (e.g. “New Session”, “Archive All”, “Unarchive All”) and styling to show them on hover/focus.
• Extends the shared Action List widget to support clickable submenu chevrons and an option to not reserve submenu space for non-submenu rows.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/vs/sessions/contrib/sessions/browser/views/sessionsViewPane.ts	Deleted file (was effectively empty/placeholder in this PR diff).
src/vs/sessions/contrib/sessions/browser/views/sessionsViewActions.ts	Adds section toolbar actions (new session/archive/unarchive) with confirmation + storage.
src/vs/sessions/contrib/sessions/browser/views/sessionsList.ts	Renders a section-header toolbar with scoped context keys for section type.
src/vs/sessions/contrib/sessions/browser/sessionsProvidersServiceInterface.ts	Deleted file (was effectively empty/placeholder in this PR diff).
src/vs/sessions/contrib/sessions/browser/sessionsListControl.ts	Deleted file (was effectively empty/placeholder in this PR diff).
src/vs/sessions/contrib/sessions/browser/media/sessionsList.css	Shows section toolbar on row hover/focus.
src/vs/sessions/contrib/sessions/browser/defaultCopilotSessionsProvider.ts	Deleted file (was effectively empty/placeholder in this PR diff).
src/vs/sessions/contrib/remoteAgentHost/browser/remoteAgentHostSessionsProvider.ts	Normalizes browse action label to localized “Folders”.
src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts	Localizes and normalizes browse action labels (“Folders”, “Repositories”).
src/vs/sessions/contrib/chat/browser/sessionWorkspacePicker.ts	Workspace picker: provider change revalidation, recents removal, browse submenu grouping, submenu alignment behavior.
src/vs/sessions/SESSIONS_PROVIDER.md	Updates diagram text to reflect current UI areas.
src/vs/platform/actionWidget/browser/actionList.ts	Adds submenu chevron click handling + reserveSubmenuSpace option; adjusts submenu rendering.

Comments suppressed due to low confidence (2)

src/vs/sessions/contrib/chat/browser/sessionWorkspacePicker.ts:345

• localize key workspacePicker.browse is reused with a different default message ("Select...") than other call sites in this file. This can break localization (key collisions) and cause wrong strings to be shown. Please use a unique key for this specific label.

				kind: ActionListItemKind.Action,
				label: localize('workspacePicker.browse', "Select..."),
				group: { title: '', icon: Codicon.folderOpened },
				item: {},

src/vs/sessions/contrib/chat/browser/sessionWorkspacePicker.ts:355

• localize key workspacePicker.browse is reused with different default strings ("Select {0}..." vs other variants in this file). Localization keys should map 1:1 to a specific message; otherwise extraction/translation can collide. Please introduce a distinct key for this variant.

					kind: ActionListItemKind.Action,
					label: localize(`workspacePicker.browse`, "Select {0}...", action.label),
					group: { title: '', icon: action.icon },
					item: { browseActionIndex: i },