Allow direct import of .caf (Core Audio Format) files.

* The Problem: Anyone recording on Apple devices (using Voice Memos, GarageBand, or Logic) frequently gets ⁠.caf⁠ files by default. Right now, users have to waste time using third-party apps to convert these to ⁠.wav⁠ or ⁠.mp3⁠ before bringing them into WaveAI. * The Fix: Adding native ⁠.caf⁠ support removes this frustrating extra step. Mac and iOS users can just drag and drop their original files. * Bonus Benefit: Standard ⁠.wav⁠ files have a 4GB size limit, but ⁠.caf⁠ does not. Supporting this format future-proofs WaveAI for users uploading extra-long, high-resolution audio files.