Fixed solution overlay for small areas

[TudorEsan]

Motivation

Fix overlay hints overlapping with the game grid area, making them unreadable and interfering with gameplay.

Proposal

• Increased z-index from 10 to 1000 for overlay boxes to ensure they render above game cells
• Added smart text positioning that places labels above small overlay boxes (< 100px width or < 40px height) instead of inside them
• Improved font size calculation for better responsiveness

Test Plan

Tested it manually here is a before and after

Before:

After: