[trees] Path Store Migration | Expansion & getItem

[SlexAxton]

• path-store item lookup surface:
  - getItem(path) on the controller
  - getItem(path) on PathStoreFileTree
  • item-scoped handles:
    • all items: getPath(), isDirectory()
    • directory-only: isExpanded(), expand(), collapse(), toggle()
  • pointer-driven expansion/collapse in the rendered tree
  • file-row click remains no-op
  • flattened-row click expands via the terminal-directory semantics
  • virtualized window stays coherent after collapse while scrolled
  • docs path-store lane updated to Expansion + Collapse
  • lightweight getItem(path) benchmark harness added

[vercel]

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Project	Deployment	Actions	Updated (UTC)
pierrejs-diff-demo	Ready	Preview	Apr 7, 2026 6:58pm
pierrejs-docs	Ready	Preview	Apr 7, 2026 6:58pm