fix(media): recognize MP3 and M4A as voice-compatible audio (#15438)

* fix(media): recognize MP3 and M4A as voice-compatible audio

Telegram sendVoice supports OGG/Opus, MP3, and M4A, but
isVoiceCompatibleAudio only recognized OGG/Opus formats.

- Add MP3 and M4A extensions and MIME types
- Use explicit MIME set instead of substring matching
- Handle MIME parameters (e.g. 'audio/ogg; codecs=opus')
- Add test coverage for all supported and unsupported formats

* fix: narrow MIME allowlist per review feedback

Remove audio/mp4 and audio/aac from voice MIME types — too broad.
Keep only M4A-specific types (audio/x-m4a, audio/m4a).
Add audio/mp4 and audio/aac as negative test cases.

* fix: align voice compatibility and channel coverage (#15438) (thanks @azade-c)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/media/audio.ts

@@ -1,14 +1,32 @@
 import { getFileExtension } from "./mime.js";
 
-const VOICE_AUDIO_EXTENSIONS = new Set([".oga", ".ogg", ".opus"]);
+const VOICE_AUDIO_EXTENSIONS = new Set([".oga", ".ogg", ".opus", ".mp3", ".m4a"]);
+
+/**
+ * MIME types compatible with voice messages.
+ * Telegram sendVoice supports OGG/Opus, MP3, and M4A.
+ * https://core.telegram.org/bots/api#sendvoice
+ */
+const VOICE_MIME_TYPES = new Set([
+  "audio/ogg",
+  "audio/opus",
+  "audio/mpeg",
+  "audio/mp3",
+  "audio/mp4",
+  "audio/x-m4a",
+  "audio/m4a",
+]);
 
 export function isVoiceCompatibleAudio(opts: {
   contentType?: string | null;
   fileName?: string | null;
 }): boolean {
-  const mime = opts.contentType?.toLowerCase();
-  if (mime && (mime.includes("ogg") || mime.includes("opus"))) {
-    return true;
+  const mime = opts.contentType?.toLowerCase().trim();
+  if (mime) {
+    const baseMime = mime.split(";")[0].trim();
+    if (VOICE_MIME_TYPES.has(baseMime)) {
+      return true;
+    }
   }
   const fileName = opts.fileName?.trim();
   if (!fileName) {