fix: add .input-label CSS selector dot for Array/Target labels

[C4aZy]

📝 Description

Added Array and Target labels above the input fields in the Binary Search Visualizer to improve UI clarity. Previously, the inputs had no context labels, making it unclear what each field was for — especially for new users.
Changes made:

Wrapped each input in an .input-group div
Added an .input-label element above each input (Array and Target)
Added CSS for .input-group and .input-label in the style block
Fixed missing . in .input-label CSS selector

🔗 Linked Issue

Closes #750

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📋 Contribution Checklist

• My code strictly adheres to the project guidelines (Standard library only, procedural code, clean spacing).
• I have verified that my files are placed in the correct directory.
• I have tested my changes thoroughly on my local machine.
• I have included interactive emojis and clean console/UI outputs.
• GSSoC 2026: I have been formally assigned to this issue and noted it above.

[vercel]

@C4aZy is attempting to deploy a commit to the Anuj's projects Team on Vercel.

A member of the Team first needs to authorize it.

[C4aZy]

@steam-bell-92 please review

[github-actions]

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