feat: extract shared DateRangeFilter and ListTotalDisplay components (#215, #216)

[daveharmswebdev]

Summary

• AC1 — Shared DateRangeFilter (Feature: Extract Date Range selector into reusable shared component #215): Extracted DateRangeFilterComponent and getDateRangeFromPreset() utility to shared. Expenses and Income both now use the same date range filter with presets (All Time, This Month, This Quarter, This Year, Custom Range). Income upgraded from basic From/To pickers to preset-based filtering with sessionStorage persistence.
• AC2 — Shared ListTotalDisplay (Feature: Extract total amount display into reusable shared component #216): Created ListTotalDisplayComponent for consistent currency total display. Added TotalAmount to backend PagedResult<T> via SumAsync before pagination. Both Expenses and Income pages show their respective totals using the shared component.
• 25 files changed: 10 new files created, 15 existing files modified across frontend and backend

Test plan

• Frontend unit tests: 2,466 passing (107 test files) — 42 new tests added
• Backend tests: 1,489 passing (946 + 85 + 458) — 5 new tests added
• E2E tests: 6 new tests passing (3 income date range, 1 income total, 2 expense total)
• Zero TypeScript compilation errors
• All existing tests unaffected (no regressions)

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