0.0.7

0.0.7 — Separator batch-change + bulk-op robustness

• Change the filename separator across the whole vault. Editing the
  separator in settings now opens a confirm dialog and rewrites only the
  trekey-boundary separator on every location-tagged file — symbols inside the
  title are preserved — via the link-safe rename API. One-directional, like the
  tag engine. Includes a dry-run count + collapsible file list and a one-step
  undo command.
• Separator validation relaxed — any non-empty value with no letters,
  digits, or / (was "exactly one character"); multi-character separators are
  allowed.
• Bulk operations are now robust and observable:
  • Per-file error isolation — one broken file (e.g. duplicate YAML keys)
    no longer aborts a bootstrap or separator pass; failures are collected and
    listed in a "skipped files" modal.
  • Live progress — a progress notice (N/total) during bootstrap and
    separator change.
  • Undo preserved on interruption — the undo record is saved even if the
    pass is cut short.
• Internal: shared assembleBasename helper (slot order + separator) and
  separatorMigratedName (decompose with the old separator, re-emit with the
  new one).