fix(nav): shorten hover dropdown linger

[txhno]

Description

• shorten the desktop nav dropdown hover animation used around the MeshMap playground entry
• limit the dropdown transition to quick opacity/transform timing instead of the longer generic nav transition

Related Issues

• Fixes [UI] fix long duration for tooltip hover on meshmap playground #7644

Changes Made

• reduced the dropdown exit animation from 0.18s to 0.12s
• reduced the dropdown open animation from 0.3s to 0.18s
• replaced the dropdown's long 0.8s transition with a short dropdown-specific opacity/transform transition

Checklist

• Changes tested locally
• Code reviewed
• Documentation updated (if necessary)
• Unit tests added (if applicable)

Validation

• npx --yes prettier --check src/sections/General/Navigation/navigation.style.js
• verified the updated dropdown timing values in navigation.style.js

[Yash-Raj-5424]

lgtm

[github-actions]

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[saurabhraghuvanshii]

@txhno @Yash-Raj-5424 how both of you verified these changes?? Please attach video