Bug #1: the first/Primary (calibration) photo rendered broken because its
in-memory capture Blob was assigned to <img src> directly (String(Blob)=
"object Blob"). resolvePhotoUrl() now mints a blob: object URL (revoked on
unload) and falls back to the stored photo endpoint when there is no blob.
Bug #2: strip thumbnails used a flat dark bg; now carry the gray checkerboard
from the Capture lineup (MeasurePanel) so transparent inventory PNGs read the
same on both screens.
Also harden missingMinimums to filter kept internally (pre-existing test 7
failed on the clean base because it passed un-kept items).
Ty
0612ce66a6