Sergey Krylov d8070209ed feat(frontend): add structural skeletons matching reference loading states
- Portfolio history: chart-loading skeleton with shimmer area and dashed guide
- Analytics: 2 summary cards + 6 detail grid cards with skel bars
- Title/yield: 3 skeleton bars (label, value, daily) when portfolio loading
- Events card already had skeleton table (no change needed)
- Fix test expectation for operations limit (7 -> 100)
2026-06-27 20:47:04 +03:00
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