0.0.8 — Scoped bootstrap, duplicate-tag cleanup, robustness

• Scoped bootstrap target picker — onboard a folder/module subtree instead
  of only the whole vault. Checkbox tree with drag-to-select, filename search, a
  "notes without a tag only" toggle, a selection count, and already-tagged
  badges. Sidebar header buttons (bootstrap / rename tag / undo) and a "new
  note" command round out the entry points.
• Duplicate location-tag cleanup — one note = one location per namespace.
  Sync warns when a note carries duplicate location tags, and a new "check
  duplicate location tags" command opens a modal to pick which tag to keep per
  note; the rest are removed from frontmatter (undoable, with an "undo last
  duplicate-tag cleanup" command). The modal shows the total count, scrolls
  within the viewport, and batches at 50 notes for large runs.
• Location tags belong in frontmatter — settings and README now state that
  cascade and bootstrap read and rewrite frontmatter tags, one per note.
• Robustness / cleanup — every assembled vault path goes through
  normalizePath(); cascade rename now isolates per-file frontmatter errors
  (try/catch + skipped-files modal), matching bootstrap and separator change.