When searching 'lord', library cache instantly showed Lord Huron,
Lorde, etc. But the full MB+LB search returned empty (filtered by
minBlendedScore) and overwrote the local results with 'no results'.
Now executeFullSearch preserves local results:
- If full search has results, merge library-only entries into them
(dedup by name) so local artists aren't lost
- If full search is empty but local results exist, keep local results
- Only show empty state when both are empty
Added mergeLocalIntoFull() for deduplicating local results against
the full search response by artist name and album title+artist.
yonlu
cd0e7cea28