Enhancement : Keep the view in sync without a window reload

[Sillot]

Selecting a different storage location used to prompt for a window reload, and
the Notes view showed nothing from the new folder until it was accepted. The tree
now applies the change in place, and keeps itself in sync with what is on disk.

Changes

• The storage location and notes.notesExtensions apply immediately, no reload
• Notes and folders added or removed outside of the window are picked up on their own
• New Reveal in File Explorer on the context menu of a note or a folder
• Picking a storage location now saves it in the workspace settings by default,
  or in your own editor settings, so a personal path need not land in a
  .vscode/settings.json that gets committed
• newNote, newFolder and deleteNote called refresh() outside their fs
  callbacks, so new items only showed up after a manual refresh

New settings

Setting	Default
notes.storeLocationInWorkspace	true
notes.watchExternalChanges	true
notes.watchIntervalSeconds	5 (one of 2, 3, 5, 10, 30)

Notes for review

• A file system watcher alone is not enough: a storage location on a synced
  folder, or on a Windows drive seen from WSL, never delivers events. The open
  folders are polled too — one readdir each, ~10 ms per folder in that slow
  case, and nothing at all while the view is hidden.
• Tree items now carry a stable id. Without it an automatic refresh collapses
  whatever folders the user had opened.
• notes.storeLocationInWorkspace is scope: application on purpose: it is a
  preference about where your own settings live, so a repository must not be
  able to set it.
• On WSL, revealFileInOS receives a Linux path and fails silently, so the path
  goes through wslpath -w and explorer.exe instead.
• The .eslintrc.json, tsconfig.json and vscode-test changes are unrelated
  to the feature: npm test could not run at all before them.

Testing

npm test covers the change detection, and the whole thing was exercised by hand
in an Extension Development Host.

The features were made with an AI Agent.