feat: add beat preview player with 30-second clip

[brightpixel-dev]

Overview

Buyers need to preview beats before purchasing a license. Implement a 30-second audio preview player that streams from IPFS. The full untagged beat should only be accessible after a license purchase.

Acceptance Criteria

• Audio plays in-card (no page navigation) on 'Preview' button click
• Hard stop at 30 seconds
• Play/pause toggle with keyboard support (spacebar)
• Progress bar showing elapsed time
• Only one preview plays at a time (pause others when a new one starts)
• Works on mobile browsers

Technical Approach

Use the HTML5 <audio> element with a time-limit enforced via ontimeupdate. IPFS gateway URL from ipfs_cid field on the sample.

Branch: feat/audio-preview

[barry01-hash]

My chief, i will love to work on this issue

[TCROWN10]

I would love to work on this issue