fix(audio): prevent browser OOM crash during waveform generation by skipping decoding on files larger than 100MB

[AdityaNarayanPadhi]

Summary

This PR fixes a browser-crashing out-of-memory (OOM) vulnerability caused by decodeAudioData when loading and parsing very large video files (500MB to 2GB+) in the browser's heap space (#1501).

Changes

• Introduced a 100MB file size ceiling check inside extractWaveform in useAudioWaveform.ts.
• If a file exceeds 100MB, the hook returns an empty waveform array and immediately sets isLoading to false without allocating buffer memory or decoding PCM channels.
• WaveformCanvas gracefully handles empty samples arrays by showing a clean placeholder track line, maintaining standard visual timeline alignment.

Verification

• Uploading small files (e.g. <50MB) continues to generate and render custom audio waveforms seamlessly.
• Uploading large video files (e.g. 500MB to 2GB) no longer freezes browser tabs or triggers out-of-memory errors; it falls back cleanly to the placeholder track line.

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[github-actions]

👋 Thanks for your PR, @AdityaNarayanPadhi!

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