permissions picker warnings and improved hover

[justschen]

• warning the first time you switch to auto approve or auto pilot
• if global auto approve is on, you don't reset your permission per session
• better permission picker.

[Copilot]

Pull request overview

Improves the chat permission picker UX by adding first-time warnings for elevated permission modes, refining option presentation, and aligning session permission reset behavior with the global auto-approve setting.

Changes:

• Add warning prompts when switching to Bypass Approvals or Autopilot for the first time per window session.
• Preserve per-session permission level across new sessions when global auto-approve is enabled.
• Add an ActionList option to render item descriptions below the title and apply it to the permission picker.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/vs/workbench/contrib/chat/browser/widget/input/permissionPickerActionItem.ts	Adds first-time warnings + richer option descriptions and layout options for the permission picker.
src/vs/workbench/contrib/chat/browser/widget/input/chatInputPart.ts	Changes when the permission level resets on new sessions based on global auto-approve.
src/vs/platform/actionWidget/browser/actionWidget.css	Adds styling for “description below” list rendering.
src/vs/platform/actionWidget/browser/actionList.ts	Introduces descriptionBelow list option and adjusts row height/classing accordingly.

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