Replaced the cramped 3-column CSS Grid mana layout with simple
flexbox rows matching the player sidebar style:
- Status dot (green/red) + item name + mana current/max + time remaining
- Font sizes use rem units (0.65-0.72rem) matching sidebar buttons/stats
- tabular-nums for aligned numbers
- Time column has min-width so it doesn't get clipped
- No more horizontal scrolling or cut-off text
- Empty state message when no mana items equipped
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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