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.

src/app/components/soundboard-pack-view/SoundboardPackEditor.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useMemo, useRef, useState } from 'react';
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import {
   Box,
   Button,
@@ -21,6 +21,7 @@ import { uniqueShortcode } from '../../plugins/soundboard/utils';
 import { useMatrixClient } from '../../hooks/useMatrixClient';
 import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
 import {
+  getAudioDurationMs,
   playClipLocally,
   resolveClipObjectUrl,
   SOUNDBOARD_ACCEPT,
@@ -29,6 +30,49 @@ import {
 } from '../../utils/soundboardClips';
 import { stopPropagation } from '../../utils/keyboard';
 
+// Injected once: the little "now playing" equalizer bars animation.
+const EQ_STYLE_ID = 'lotus-soundboard-eq-keyframes';
+function ensureEqKeyframes() {
+  if (typeof document === 'undefined' || document.getElementById(EQ_STYLE_ID)) return;
+  const style = document.createElement('style');
+  style.id = EQ_STYLE_ID;
+  style.textContent = `
+    @keyframes lotusSbEq { 0%,100% { transform: scaleY(0.3); } 50% { transform: scaleY(1); } }
+    @media (prefers-reduced-motion: reduce) { @keyframes lotusSbEq { 0%,100% { transform: scaleY(0.6); } } }
+  `;
+  document.head.appendChild(style);
+}
+
+function PlayingBars() {
+  return (
+    <Box alignItems="Center" gap="100" style={{ height: toRem(14) }} aria-hidden>
+      {[0, 1, 2].map((i) => (
+        <span
+          key={i}
+          style={{
+            display: 'inline-block',
+            width: toRem(3),
+            height: toRem(14),
+            borderRadius: toRem(2),
+            background: color.Primary.Main,
+            transformOrigin: 'center bottom',
+            animation: `lotusSbEq 0.7s ease-in-out ${i * 0.15}s infinite`,
+          }}
+        />
+      ))}
+    </Box>
+  );
+}
+
+// Short clip length shown while adjusting a sound: "3.2s", or "1:04" if ≥ 60s.
+const formatClipSeconds = (seconds: number): string => {
+  if (!Number.isFinite(seconds) || seconds < 0) return '';
+  if (seconds < 60) return `${seconds.toFixed(1)}s`;
+  const m = Math.floor(seconds / 60);
+  const s = Math.round(seconds % 60);
+  return `${m}:${s.toString().padStart(2, '0')}`;
+};
+
 type ClipDraft = {
   url: string;
   body: string;
@@ -59,9 +103,20 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
   const [error, setError] = useState<string>();
   const [emojiFor, setEmojiFor] = useState<string>(); // shortcode currently picking an emoji
   const [busyPreview, setBusyPreview] = useState<string>();
+  const [playingKey, setPlayingKey] = useState<string>();
+  const [durations, setDurations] = useState<Map<string, number>>(new Map()); // shortcode -> seconds
+  const audioElRef = useRef<HTMLAudioElement | null>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
   const emojiAnchorRef = useRef<HTMLElement | null>(null);
 
+  useEffect(() => {
+    ensureEqKeyframes();
+    return () => {
+      audioElRef.current?.pause();
+      audioElRef.current = null;
+    };
+  }, []);
+
   const existing = useMemo(() => pack.getClips(), [pack]);
   const clipCount = existing.filter((c) => !deleted.has(c.shortcode)).length + uploads.length;
 
@@ -78,19 +133,47 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
     });
   };
 
+  const stopPlayback = useCallback(() => {
+    audioElRef.current?.pause();
+    audioElRef.current = null;
+    setPlayingKey(undefined);
+  }, []);
+
   const preview = useCallback(
     async (id: string, mxc: string, volume: number) => {
+      // Clicking the clip that's already playing stops it (toggle).
+      if (audioElRef.current && playingKey === id) {
+        stopPlayback();
+        return;
+      }
+      stopPlayback(); // stop any other clip first
       setBusyPreview(id);
       try {
         const url = await resolveClipObjectUrl(mx, mxc);
-        playClipLocally(url, volume / 100);
+        const audio = playClipLocally(url, volume / 100);
+        if (audio) {
+          audioElRef.current = audio;
+          setPlayingKey(id);
+          audio.addEventListener('loadedmetadata', () => {
+            if (Number.isFinite(audio.duration)) {
+              setDurations((prev) => new Map(prev).set(id, audio.duration));
+            }
+          });
+          const clear = () => {
+            if (audioElRef.current === audio) audioElRef.current = null;
+            setPlayingKey((k) => (k === id ? undefined : k));
+          };
+          audio.addEventListener('ended', clear);
+          audio.addEventListener('pause', clear);
+          audio.addEventListener('error', clear);
+        }
       } catch {
         /* ignore preview errors */
       } finally {
         setBusyPreview(undefined);
       }
     },
-    [mx],
+    [mx, playingKey, stopPlayback],
   );
 
   const handleFiles = useCallback(
@@ -112,6 +195,8 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
             throw new Error(`"${file.name}" is too large (max 1 MB).`);
           }
           // eslint-disable-next-line no-await-in-loop
+          const durationMs = await getAudioDurationMs(file);
+          // eslint-disable-next-line no-await-in-loop
           const res = await mx.uploadContent(file, { type: file.type || 'audio/mpeg' });
           const mxc = res.content_uri;
           if (!mxc) throw new Error('Upload failed.');
@@ -126,7 +211,7 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
               body: name,
               emoji: '',
               volume: 100,
-              info: { mimetype: file.type || undefined, size: file.size },
+              info: { mimetype: file.type || undefined, size: file.size, duration: durationMs },
             },
           ]);
         }
@@ -182,6 +267,9 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
         setDraft(key, patch, base);
       }
     };
+    const isPlaying = playingKey === key;
+    const clipSeconds =
+      durations.get(key) ?? (base.info?.duration != null ? base.info.duration / 1000 : undefined);
     return (
       <Box
         key={key}
@@ -197,12 +285,16 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
         <IconButton
           size="300"
           radii="300"
-          variant="Secondary"
+          variant={isPlaying ? 'Primary' : 'Secondary'}
           disabled={busyPreview === key}
           onClick={() => preview(key, base.url, rowVolume)}
-          aria-label={`Preview ${rowBody}`}
+          aria-label={isPlaying ? `Stop ${rowBody}` : `Preview ${rowBody}`}
         >
-          {busyPreview === key ? <Spinner size="100" /> : <Icon size="100" src={Icons.Play} />}
+          {busyPreview === key ? (
+            <Spinner size="100" />
+          ) : (
+            <Icon size="100" src={isPlaying ? Icons.Pause : Icons.Play} filled={isPlaying} />
+          )}
         </IconButton>
         <IconButton
           size="300"
@@ -227,7 +319,24 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
             aria-label="Clip name"
           />
         </Box>
-        <Box alignItems="Center" gap="100" shrink="No" style={{ width: toRem(120) }}>
+        <Box
+          alignItems="Center"
+          justifyContent="End"
+          gap="100"
+          shrink="No"
+          style={{ width: toRem(52) }}
+        >
+          {isPlaying ? (
+            <PlayingBars />
+          ) : (
+            clipSeconds !== undefined && (
+              <Text size="T200" priority="300" style={{ whiteSpace: 'nowrap' }}>
+                {formatClipSeconds(clipSeconds)}
+              </Text>
+            )
+          )}
+        </Box>
+        <Box alignItems="Center" gap="100" shrink="No" style={{ width: toRem(148) }}>
           <Icon size="50" src={Icons.VolumeHigh} />
           <input
             type="range"
@@ -237,9 +346,12 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
             defaultValue={rowVolume}
             disabled={!canEdit || markedDeleted}
             onChange={(e) => commit({ volume: parseInt(e.target.value, 10) })}
-            style={{ flexGrow: 1 }}
+            style={{ flexGrow: 1, minWidth: 0 }}
             aria-label="Clip volume"
           />
+          <Text size="T200" priority="300" style={{ width: toRem(30), textAlign: 'right' }}>
+            {rowVolume}%
+          </Text>
         </Box>
         {canEdit && !isUpload && (
           <IconButton
@@ -308,7 +420,13 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
         {existing.map((c) =>
           renderRow(
             c.shortcode,
-            { url: c.url, body: c.body ?? c.shortcode, emoji: c.emoji ?? '', volume: c.volume },
+            {
+              url: c.url,
+              body: c.body ?? c.shortcode,
+              emoji: c.emoji ?? '',
+              volume: c.volume,
+              info: c.info,
+            },
             false,
             deleted.has(c.shortcode),
           ),

src/app/features/call/CallSoundboard.tsx

@@ -196,7 +196,8 @@ export function CallSoundboard({ callEmbed }: CallSoundboardProps) {
                                   aria-label={`Play ${clip.name}`}
                                   style={{
                                     width: toRem(76),
-                                    height: toRem(76),
+                                    minHeight: toRem(76),
+                                    height: 'auto',
                                     padding: config.space.S100,
                                     borderRadius: config.radii.R400,
                                     border: `${config.borderWidth.B300} solid ${color.Surface.ContainerLine}`,
@@ -215,7 +216,19 @@ export function CallSoundboard({ callEmbed }: CallSoundboardProps) {
                                       clip.emoji || '🔊'
                                     )}
                                   </Text>
-                                  <Text size="T200" truncate style={{ maxWidth: '100%' }}>
+                                  <Text
+                                    size="T200"
+                                    style={{
+                                      maxWidth: '100%',
+                                      textAlign: 'center',
+                                      wordBreak: 'break-word',
+                                      lineHeight: 1.15,
+                                      display: '-webkit-box',
+                                      WebkitLineClamp: 3,
+                                      WebkitBoxOrient: 'vertical',
+                                      overflow: 'hidden',
+                                    }}
+                                  >
                                     {clip.name}
                                   </Text>
                                 </Box>

src/app/utils/soundboardClips.ts

@@ -53,3 +53,20 @@ export const playClipLocally = (
     return undefined;
   }
 };
+
+/** Read an audio file's duration in milliseconds from its metadata (no playback). */
+export const getAudioDurationMs = (file: Blob): Promise<number | undefined> =>
+  new Promise((resolve) => {
+    const url = URL.createObjectURL(file);
+    const audio = new Audio();
+    audio.preload = 'metadata';
+    const done = (ms: number | undefined) => {
+      URL.revokeObjectURL(url);
+      resolve(ms);
+    };
+    audio.addEventListener('loadedmetadata', () =>
+      done(Number.isFinite(audio.duration) ? Math.round(audio.duration * 1000) : undefined),
+    );
+    audio.addEventListener('error', () => done(undefined));
+    audio.src = url;
+  });