Add new area labels to community PR track mapping (#62314)

Label | Description
-- | --
area:integrations/git/panel | Feedback for the Git panel UI and
behavior.
area:gpui/graphics/wgpu | Feedback for GPUI's WGPU graphics backend,
including initialization and rendering.
area:breadcrumbs | Feedback for editor path and symbol breadcrumbs.
area:title bar | Issues suitable for title bar.
area:ai/agent thread/checkpoints | Feedback for Agent checkpoint
creation, comparison, restoration, and related Git behavior.
area:ai/agent thread/tools | Feedback for built-in Agent tools,
including execution, permissions, inputs, and outputs.

Release Notes:
- N/A