fix(animated-beam): make default duration deterministic

[iharshyadav]

Summary

This PR fixes inconsistent animation timing in Animated Beam when multiple beams are rendered without explicitly setting a duration.

Root Cause

The component used a random default duration per instance (Math.random() * 3 + 4), which made beams drift out of sync.

Fix

• Changed the default duration to a deterministic value: 5
• Kept behavior unchanged for users who already pass a custom duration

Files Changed

• apps/www/registry/magicui/animated-beam.tsx
• apps/www/public/r/animated-beam.json
• apps/www/public/llms-full.txt

Validation

• Ran dependency install with pnpm
• Rebuilt registry artifacts
• Verified lint/check flow relevant to changed files
• Confirmed no API changes, only stable default timing behavior

Related

Closes #840

[vercel]

@iharshyadav is attempting to deploy a commit to the product-studio Team on Vercel.

A member of the Team first needs to authorize it.

[Yeom-JinHo]

@iharshyadav
Thanks for working on this and for the quick turnaround.

I think this PR fixes the default duration randomness issue (Math.random() * 3 + 4), but it may not fully solve timing drift in cases where duration/delay are passed explicitly (for example, the server-connections repro). In those cases, changing the default duration has no effect.

The remaining drift seems to come from repeatDelay: 0 being hardcoded. Beams with different duration/delay values can look aligned in the first cycle, then gradually go out of phase.

Would you be able to add a follow-up commit in this PR to expose repeatDelay (and optionally repeat) as props so explicit timing setups can stay synchronized across cycles?