gps-plus-slam-app-framework 1.28.0

Added

• OccluderSinkHandle.triangleCount() (visualization/occluder-sink):
  the mesh's triangle count, 0 once disposed, for a readout (Tour Viewer
  follow-up F17). A required member: a handle built by hand (a test fake)
  needs it too.

Fixed

• An occluder mesh result from before clear() is dropped
  (visualization/occluder-sink): a worker result requested before a clear
  (a tracking restart) arrived after it and put the old mesh back, so a
  raycast against the mesh could pick a surface from before the restart
  (Tour Viewer PR #609 review).
• downloadBlob and syncToExternalZip abort a failed write
  (storage/zip-export): both wrote through the save picker or the external
  handle without abort(), so a failed write left the writable open, holding
  the lock and the temporary file. They use writeFileOrAbort
  (Tour Viewer M6 E2 plan review #7).
• copyWithFeedback never rejects (utils/copy-with-feedback): a
  hook that throws is logged as a warning and the copy's outcome stands.
  1.27.0 rejected then, and its call sites discard the promise, so the
  throw was an unhandled rejection (Tour Viewer follow-up F17).