fix: ie-totaltracks element id + JP-strict/US-fallback iTunes matching

Prevent false Japanese matches by never using JP title-only fallback.
Strategy: JP strict → US strict → US title-only so niche Western tracks
still resolve but same-English-title Japanese songs don't pollute results.

Also fix JS error in autofillItunes: ie-total → ie-totaltracks.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui.js

@@ -450,7 +450,7 @@ export async function autofillItunes() {
     if (d.genre)       document.getElementById('ie-genre').value = d.genre;
     if (d.year)        document.getElementById('ie-year').value  = d.year;
     if (d.trackNum)    document.getElementById('ie-track').value = d.trackNum;
-    if (d.totalTracks) document.getElementById('ie-total').value = d.totalTracks;
+    if (d.totalTracks) document.getElementById('ie-totaltracks').value = d.totalTracks;
     if (d.coverUrl) {
       S._infoArtData = { url: d.coverUrl };
       document.getElementById('info-edit-art-preview').innerHTML =