feat(dashboard): show exact token counts on hover in usage analytics cards and tables

[ZaimMarzuki]

Summary

Shows the exact uncompacted token count and cost in native tooltip (title) when hovering over compact metrics (e.g. 1.5B, 131.5K, 6.9M) in the Usage Analytics dashboard.

Changes

• src/shared/components/analytics/charts.tsx:
  • Added optional tooltip prop to StatCard and CompactStatGrid item definitions (falling back to value).
  • Added full formatted number tooltips (fmtFull) to token counts across ApiKeyTable, ProviderTable, and MostActiveDay7d.
• src/shared/components/UsageAnalytics.tsx:
  • Passed exact full numbers (fmtFull) as tooltips to primary KPI cards (totalTokens, promptTokens, completionTokens, estCost) and performance secondary metrics (avgTokensPerReq, costPerReq, fastRequests).
• src/shared/components/analytics/ModelTable.tsx:
  • Added full formatted token count tooltips to input, output, and total token cells in the model breakdown table.
• src/shared/components/analytics/RequestCountTable.tsx:
  • Added full formatted token count tooltip to total token cells.
• tests/unit/ui/analytics-token-hover-tooltip.test.tsx:
  • Added unit test suite covering tooltips in StatCard, CompactStatGrid, ApiKeyTable, ProviderTable, ModelTable, and RequestCountTable.

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