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Turkish upper and lower case queries now return the same results everywhere a title can be searched. Lower-casing the dotted capital "İ" (U+0130) leaves a combining dot behind, so "İnş" and "inş" reached different search arms and different results. - Case folding is locale-invariant: `toLowerCase()`, never `toLocaleLowerCase()`, which under a Turkish or Azeri OS locale maps ASCII "I" to the dotless "ı". - The Electron content search composes to NFC and drops the leftover combining marks before tokenizing, and its LIKE/GLOB pattern builders additionally spell the `'tr'`-locale İ forms, since SQLite LIKE folds only ASCII. - A shared `foldSearchText` covers every in-memory filter: channel lists, the Xtream and Stalker catalogs, category filters, collections, the EPG guide, the command palette, sources, the playlist switcher and the download lists. - Composing before the strip keeps canonically equivalent spellings equal while the fold stays accent-sensitive; the Turkish I/ı pair is deliberately left alone, as the FTS index does not fold it either. Covered by a SQLite-backed spec over the real trigram index plus regression cases in the affected renderer specs. Closes #609. Co-Authored-By: Justin Willhite <5132924+thejdubb02@users.noreply.github.com> Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>