- Implemented.

Safari/iPhone recording now uses MP4/AAC when WebM is unavailable.
WebM remains the default when supported and FFmpeg is disabled.
Added optional FFmpeg profiles: recommended M4A/AAC-LC or requested 
MP4/H.264 + AAC.
Added MIME-aware, playsinline audio playback.
Added dashboard controls under Plans & Platform → Voice Transcoding / 
FFmpeg.
Added Apache/Nginx media MIME configuration and documentation.
Core implementation: voice_transcoder.php (line 72), messages.php (line 
86), and cyberchat-app.js (line 635).

.htaccess

@@ -20,6 +20,15 @@
     </FilesMatch>
 </IfModule>
 
+# Voice playback MIME types, including Safari/iPhone-compatible AAC in MP4.
+<IfModule mod_mime.c>
+    AddType audio/webm .webm
+    AddType audio/wav .wav
+    AddType audio/aac .aac
+    AddType audio/mp4 .m4a
+    AddType video/mp4 .mp4
+</IfModule>
+
 # Deny direct access to storage and internal PHP libraries
 <IfModule mod_rewrite.c>
     RewriteEngine On