feat(soundboard): clip duration, playing indicator, volume layout, name wrap

Editor (SoundboardPackEditor): show each clip's length in seconds (stored on
upload via getAudioDurationMs, and captured on preview for existing clips); the
preview button now toggles play/stop with a 'now playing' equalizer indicator;
reworked the volume control into a fixed cell with a % readout so the slider's
max no longer collides with the delete button.

Call soundboard: clip names wrap (up to 3 lines, word-break) instead of being
truncated with an ellipsis; cards grow to fit.

TODO: logged the basic audio-editor / video->audio-extractor as a large project.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LOTUS_TODO.md

@@ -148,6 +148,10 @@ After Phases A–C the client spec is ~complete. What's left, flagged by **what
 
 ## 📋 Open Feature Backlog
 
+### [ ] Basic in-app audio editor / video→audio extractor (LARGE PROJECT)
+
+A minimal audio editor for soundboard clips and voice content. Scope: (1) **trim/clip** an audio file to a chosen start/end (waveform scrubber, in/out handles); (2) **upload a video file → strip and discard the video track, keep only the audio** (extract audio, then the source video is dropped — never uploaded/stored); (3) minimal edits only (trim, maybe gain/normalize, fade in/out) — not a full DAW. Likely Web Audio API (`AudioContext.decodeAudioData` → trim `AudioBuffer` → re-encode) + `MediaRecorder`/an encoder for output; video demux via a `<video>`+`MediaElementSource` capture or ffmpeg.wasm (weigh bundle cost). Feeds the soundboard uploader (`utils/soundboardClips.ts`, `SoundboardPackEditor`) and attachments. Design under TDS + native-cinny law. Big build — plan a dedicated session; evaluate ffmpeg.wasm size/CSP (wasm) before committing.
+
 ### [ ] P4-4 · Math / LaTeX Rendering (LOW PRIORITY)
 
 Render `$…$` / `$$…$$` via KaTeX; graceful fallback to raw text. **Sanitizer must be patched** — `src/app/utils/sanitize.ts` (sanitize-html, `disallowedTagsMode:'discard'`) strips all MathML: add `<math><mi><mo><mn><mrow><mfrac><msqrt><mroot><msub><msup><msubsup><munder><mover><mtable><mtr><mtd>…` + `annotation` to `permittedHtmlTags`, and `xmlns`/`display`/`mathvariant` to `permittedTagToAttributes`. Parser: split text nodes on `/(\$\$.*?\$\$|\$.*?\$)/g` in `react-custom-html-parser.tsx` → `<KaTeX>`. Lazy-import `katex/dist/katex.min.css` only when a math block renders. Verify KaTeX bundle-size impact.