Preserve and display bilingual and phonetic lyric cues

docs/lyric-languages.md

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+# Translations and pronunciation
+
+A cue can contain a primary lyric and translation separated by ` / `:
+
+```
+[1:23.45] 主你的恩典 / Your grace is enough
+!pinyin: zhǔ nǐ de ēndiǎn
+```
+
+The translation and phonetic text share the primary cue timestamp. They are smaller and muted beneath it in stage lyrics, Service mode, Presenter and OBS. The notes API preserves optional `secondary` and `phonetic` fields. Existing documents with only text, timing and kind remain unchanged.
+
+Use `| ` continuation lines (or Shift+Enter in the editor) for tight breaks within a cue. A continuation can also carry `Primary / Translation`. Multiple timestamps copy translations and pronunciation to every occurrence. A slash without surrounding spaces, such as `and/or`, remains literal. Ordinary `! Band cue` lines retain their existing meaning.