Audio transcription fails for long recordings

User Story: As a user, I want long audio recordings to transcribe successfully, so that lengthy recordings can be processed without errors.

Acceptance Criteria:

• Audio recordings longer than 30 minutes can be submitted for transcription.
• Large supported audio files do not fail with a server error during upload or processing.
• Transcription completes successfully for audio files that previously failed because of their size.
• Shorter audio recordings continue to transcribe successfully.

Test:

1. Upload a supported short audio recording and confirm transcription completes successfully.
2. Upload a supported long audio recording over 30 minutes and start transcription.
3. Confirm the upload is accepted and processing starts without an error.
4. Confirm transcription completes and returns the expected transcript.
5. Repeat with another large recording to verify the issue is resolved consistently.

Technical note:

• The failure appears to affect the live dictation path only, not the import or meeting transcription paths.
• The live dictation flow sends audio inline to /api/voice/transcribe and does not switch to blob upload for larger files.
• Recordings over the request body limit can fail while parsing multipart form data, which leads to server errors for larger audio inputs.