* fix(search): transliterate non-ASCII letters symmetrically in FTS5 path
Songs and artists with letters like ø, æ, œ, ß were unsearchable. The
query path in server/subsonic/searching.go transliterates with
sanitize.Accents (Øystein → Oystein), but the FTS5 tokenizer's
remove_diacritics 2 only strips NFKD-decomposable marks — atomic
letters with built-in strokes/ligatures survive tokenization, so the
query side and index side disagreed.
Apply sanitize.Accents on both sides:
- normalizeForFTS now also emits an ASCII-transliterated form for each
word, so search_normalized contains the variant the query produces.
- buildFTS5Query transliterates the unquoted portion of the input so
every caller (Subsonic, REST fullTextFilter) gets the same handling.
Quoted phrases stay as typed, preserving phrase matches against the
original title/artist columns.
Existing libraries pick up the fix as records are re-scanned; users
can trigger a manual full rescan to refresh older entries.
* fix(search): cache transliteration and add ß/quoted-phrase test coverage
Address review feedback: call sanitize.Accents once per word and reuse
the result for both the punct-stripped and accent-only paths. Add missing
test entries for ß→ss transliteration and quoted Unicode phrase preservation.
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Co-authored-by: Claude <noreply@anthropic.com>
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