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>

backend/lib/metadata.js

@@ -103,19 +103,23 @@ async function lookupItunesTrackMeta(artist, title) {
         res.on('end', () => { try { resolve(JSON.parse(d).results || []); } catch { reject(new Error('parse')); } });
       }).on('error', reject);
     });
-    let results = await fetchItunes('jp');
-    if (!results.length) results = await fetchItunes('us');
-    const normT     = normalizeTitle(title);
-    const normA     = (artist || '').toLowerCase().trim();
+    const normT = normalizeTitle(title);
+    const normA = (searchArtist || '').toLowerCase().trim();
     // Split by space OR comma/semicolon/slash so "VXLLAIN, iGRES" → "vxllain" not "vxllain,"
     const firstWord = s => (s || '').toLowerCase().split(/[\s,;/]/)[0];
-    // Prefer strict match (title + first-word artist), fall back to title-only.
-    // Title-only fallback handles cases where kuromoji gave a wrong artist romanization
-    // (e.g. "Terui Jun Sei" vs iTunes "Yoshimasa Terui" — different first word).
-    const match = results.find(t =>
-      normalizeTitle(t.trackName) === normT &&
-      firstWord(t.artistName) === firstWord(normA)
-    ) || results.find(t => normalizeTitle(t.trackName) === normT);
+    const strictMatch = results => results.find(t =>
+      normalizeTitle(t.trackName) === normT && firstWord(t.artistName) === firstWord(normA)
+    );
+    const titleOnlyMatch = results => results.find(t => normalizeTitle(t.trackName) === normT);
+
+    // Strategy: JP strict → US strict → US title-only (never JP title-only to avoid
+    // false positives where JP returns a different Japanese song with the same English title)
+    const jpResults = await fetchItunes('jp');
+    let match = strictMatch(jpResults);
+    if (!match) {
+      const usResults = await fetchItunes('us');
+      match = strictMatch(usResults) || titleOnlyMatch(usResults);
+    }
     if (!match) return {};
     return {
       album:            match.collectionName || '',