feat(export): SRT/VTT subtitle export (command + TitleBar entry, #29)#171
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Wire the pure subtitle_export logic (#29 slice) into a usable feature. Backend: - Add `export_subtitles` Tauri command (path + srt/vtt format) that collects caption cues from the live timeline via the pure `opentake_domain` layer, serializes to SubRip/WebVTT, and writes the file. Returns a `SubtitleExportSummary { outPath, cueCount }` so the UI can distinguish a real export from an empty (no-caption) timeline. - Register in generate_handler!. Split the body into a testable `write_subtitles` helper; add 5 unit tests (format serde + camelCase summary + non-empty SRT/VTT round-trip + zero-cue empty timeline). Frontend: - `api.exportSubtitles` mirroring the Rust DTO (lowercase `format`). - TitleBar "Export Subtitles" entry with an SRT/VTT format popover and native save dialog; toasts the cue count, or "timeline has no subtitles" when empty. zh-CN + en i18n keys. Does not include whisper auto-transcription (separate, larger slice). Cue source is existing caption clips (clip with caption_group_id + text). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Wires the existing subtitle_export pure logic into a usable feature: new export_subtitles Tauri command (collect_caption_cues -> export_srt/vtt -> file) + TitleBar Export-Subtitles entry (.srt/.vtt) with save dialog and toast (friendly empty-timeline message). Cue source = existing caption clips (caption_group_id + text). No whisper auto-transcribe (separate). +5 backend tests; domain 209 / tauri 47 / web 184 green.
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