.aac/.wma in config but not in file uploader

[AshayK003]

Problem

config.py:19 defines ALLOWED_AUDIO_EXTENSIONS with .aac and .wma, but main.py:184 limits the file uploader to ["mp3", "wav", "m4a", "ogg"].

Solution

Either add .aac and .wma to the file uploader, or remove them from ALLOWED_AUDIO_EXTENSIONS.

Acceptance Criteria

• Allowed audio types are consistent between config and UI

Difficulty: Easy