[Bug] Storyline stats: add min-w-0 overflow guard on mobile grid

[realproject7]

Problem

PR #793 made MCap + Supply inline on mobile via grid-cols-2. On very narrow screens (320px), a large USD value combined with the 24h% badge could overflow its grid cell since there is no min-w-0 or overflow-hidden on the grid children.

Solution

Add min-w-0 to the two grid children inside the grid-cols-2 div to prevent text overflow.

Acceptance Criteria

• Grid children have min-w-0 class
• No visual changes on normal screen widths
• Long values truncate gracefully on 320px screens

Branch

task/<issue>-stats-overflow-guard