Add components for AI Customization shortcuts widget

[benibenj]

Copilot Generated Description: Introduce components for the AI Customization shortcuts widget, including a new toolbar and related functionality for managing customization items. The changes include the creation of a new widget class and updates to existing interfaces to support the new features.

[Copilot]

Pull request overview

This PR introduces a dedicated AI Customization shortcuts widget for the Agent Sessions window, refactoring the Sessions view to use the new widget and adding a component fixture for screenshot coverage.

Changes:

• Extracts the AI Customization toolbar UI/behavior into a new AICustomizationShortcutsWidget.
• Updates sessionsViewPane to instantiate the new widget and removes the inline toolbar implementation.
• Adds a new themed component fixture to render the widget in multiple states (expanded/collapsed, with MCP servers, with counts).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/vs/sessions/contrib/sessions/test/browser/aiCustomizationShortcutsWidget.fixture.ts	Adds screenshot component fixtures for the new widget with mocked services and menu/view-item plumbing.
src/vs/sessions/contrib/sessions/browser/sessionsViewPane.ts	Replaces inline customization toolbar code with AICustomizationShortcutsWidget.
src/vs/sessions/contrib/sessions/browser/media/customizationsToolbar.css	Adjusts customization toolbar CSS selectors (no longer nested under .agent-sessions-viewpane).
src/vs/sessions/contrib/sessions/browser/customizationsToolbar.contribution.ts	Exports customization item config/list and view item class for reuse (fixture); also exports the contribution class.
src/vs/sessions/contrib/sessions/browser/aiCustomizationShortcutsWidget.ts	New widget encapsulating the customization shortcuts header + toolbar + collapse/count logic.

Comments suppressed due to low confidence (1)

src/vs/sessions/contrib/sessions/browser/customizationsToolbar.contribution.ts:206

• CustomizationsToolbarContribution is now exported, but it doesn’t appear to be imported/used outside this module. Exporting it increases the module’s public surface area without a clear need.

Consider keeping this class non-exported unless there’s a concrete external consumer (the fixture only needs CUSTOMIZATION_ITEMS and CustomizationLinkViewItem).

export class CustomizationsToolbarContribution extends Disposable implements IWorkbenchContribution {

	static readonly ID = 'workbench.contrib.sessionsCustomizationsToolbar';

	constructor(

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