feat(audio): add bitrate chip control, default bitrates, and marquee pair

frontend/src/components/FileConfigCard.jsx

@@ -7,6 +7,8 @@ const QUALITY_FORMATS = ['jpg', 'jpeg', 'webp', 'avif', 'tiff'];
 const ICON_SIZES = [16, 32, 48, 256, 512];
 const DEFAULT_ICON_SIZE = 256;
 const ARCHIVE_COMPRESSION_FORMATS = ['zip', 'tar.gz', 'tar.bz2', '7z', 'tar.7z'];
+const AUDIO_BITRATE_FORMATS = ['mp3', 'ogg', 'aac', 'm4a'];
+const AUDIO_BITRATES = [128, 192, 256, 320];
 
 function rangeProgress(value, min, max) {
   return `${((value - min) / (max - min)) * 100}%`;
@@ -101,6 +103,25 @@ export function FileConfigCard({ item, index, t, onTargetFormatChange, onQuality
             />
           )}
 
+          {AUDIO_BITRATE_FORMATS.includes(item.targetFormat) && (
+            <div className="chip-field">
+              <span>{t('quality.bitrate')}</span>
+              <div className="chip-group" role="group" aria-label={t('quality.bitrate')}>
+                {AUDIO_BITRATES.map((bitrate) => (
+                  <button
+                    key={bitrate}
+                    type="button"
+                    className={`chip${item.quality === bitrate ? ' chip-active' : ''}`}
+                    aria-pressed={item.quality === bitrate}
+                    onClick={() => onQualityChange(index, bitrate)}
+                  >
+                    {bitrate}kbps
+                  </button>
+                ))}
+              </div>
+            </div>
+          )}
+
           {item.targetFormat === 'ico' && (
             <div className="chip-field">
               <span>{t('quality.iconSize')}</span>

frontend/src/components/FormatMarquee.jsx

@@ -7,6 +7,7 @@ const PAIRS = [
   ['ttf', 'woff'],
   ['epub', 'mobi'],
   ['rar', 'zip'],
+  ['wav', 'mp3'],
 ];
 
 function Pill({ from, to }) {

frontend/src/locales/en.json

@@ -22,7 +22,8 @@
     "label": "Quality",
     "compression": "Compression",
     "iconSize": "Icon size",
-    "compressPdf": "Compress as JPEG"
+    "compressPdf": "Compress as JPEG",
+    "bitrate": "Bitrate"
   },
   "job": {
     "converting": "Converting...",

frontend/src/locales/fr.json

@@ -22,7 +22,8 @@
     "label": "Qualité",
     "compression": "Compression",
     "iconSize": "Taille de l'icône",
-    "compressPdf": "Compresser en JPEG"
+    "compressPdf": "Compresser en JPEG",
+    "bitrate": "Bitrate"
   },
   "job": {
     "converting": "Conversion en cours...",

frontend/src/pages/HomePage.jsx

@@ -25,6 +25,10 @@ const DEFAULT_QUALITY = {
   'tar.bz2': 9,
   '7z': 5,
   'tar.7z': 5,
+  mp3: 192,
+  ogg: 192,
+  aac: 192,
+  m4a: 192,
 };
 
 const DEFAULT_ICON_SIZE = 256;