- Refactor UsageFooter to support inline mode with two-row layout
- Row 1: Last refresh time + refresh button (right-aligned)
- Row 2: Used + Remaining + Unit
- Update ProviderCard layout to show usage inline instead of below
- Improve text spacing: reduce gap from 1 to 0.5 for tighter label-value pairs
- Update Chinese translation: "使用" → "已使用" for better clarity
- Maintain backward compatibility with bottom display mode
This change unifies card heights and improves visual consistency
across providers with and without usage queries enabled.
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