feat(phase-6): event browsing UI — pre-match/live lists, detail page, +26 bUnit tests

Replaces PreMatch/Live placeholder pages with a shared EventListShell
(filter chips, date range, sortable virtualized-friendly table, debounced
search, live auto-refresh with odds-movement indicators) and adds a new
/events/{eventCode} detail page (asymmetric header lockup, dynamic
Match/Period tabs, Plotly.Blazor odds-over-time chart with accessible
data-table fallback, snapshot history, Excel export modal).

New primitives matching Phase 5's editorial-quant system:
- SportIcon: inline SVGs per sport (basketball=6, football=11,
  tennis=22723, hockey=43658, generic fallback)
- OddsCell: tabular mono with ▲/▼/— delta + flash on change
  (prefers-reduced-motion honored)
- OddsTimeline: Plotly.Blazor wrapper with theme-aware colors and
  <details>/<summary> data-table screen-reader fallback
- ExportDialog: From/To pickers + ExportKind radio + Esc/Enter
  keyboard, surfaces use-case errors inline
- EventListShell: shared section shell for PreMatch/Live cadence

State + service split keeps the RCL host-agnostic:
- IEventBrowsingService / EventBrowsingService — wraps repos, returns
  view-model records (EventListItem, EventDetail, EventScopeBoard,
  BetRow, OddsTimelinePoint, SnapshotHistoryEntry); pages never see
  EF or domain entities directly.
- EventBrowsingState — singleton (per-circuit in BlazorWebView) holding
  immutable PageFilter records for PreMatch and Live.

Plotly.Blazor 5.4.1 added (latest .NET 8 line; 7.x has breaking changes).
+59 RU/EN localization keys following the Phase 5 dot-segmented convention.

Tests: +26 bUnit tests (PreMatch/Live/Detail pages, OddsCell/SportIcon/
ExportDialog components, EventBrowsingState). Total 228/228 passing
(Domain 96 + Application 15 + Infrastructure 80 + UI 37; baseline 202).
Build clean (0/0).

PLAN.md: P2/P3/P5 top-level checkboxes ticked; P6 row marked Done.

plans/initial-implementation/PLAN.md

@@ -36,11 +36,11 @@ parameter configurable.
 
 - [x] Phase 0: Scraping spike (research, throwaway) [domain: backend] → [subplan](./phase-0-scraping-spike.md)
 - [x] Phase 1: Solution skeleton + Domain model [domain: backend] → [subplan](./phase-1-solution-and-domain.md)
-- [ ] Phase 2: Infrastructure — Storage [domain: backend] → [subplan](./phase-2-storage.md)
-- [ ] Phase 3: Infrastructure — Scraping [domain: backend] → [subplan](./phase-3-scraping.md)
+- [x] Phase 2: Infrastructure — Storage [domain: backend] → [subplan](./phase-2-storage.md)
+- [x] Phase 3: Infrastructure — Scraping [domain: backend] → [subplan](./phase-3-scraping.md)
 - [x] Phase 4: Application layer + Background workers [domain: backend] → [subplan](./phase-4-application-and-workers.md)
-- [ ] Phase 5: Blazor Hybrid host + Theme + i18n [domain: frontend] → [subplan](./phase-5-host-theme-i18n.md)
-- [ ] Phase 6: Event browsing UI [domain: frontend] → [subplan](./phase-6-event-browsing-ui.md)
+- [x] Phase 5: Blazor Hybrid host + Theme + i18n [domain: frontend] → [subplan](./phase-5-host-theme-i18n.md)
+- [x] Phase 6: Event browsing UI [domain: frontend] → [subplan](./phase-6-event-browsing-ui.md)
 - [ ] Phase 7: Anomaly detection [domain: fullstack] → [subplan](./phase-7-anomaly-detection.md)
 - [ ] Phase 8: Results loader [domain: fullstack] → [subplan](./phase-8-results-loader.md)
 - [ ] Phase 9: Packaging + polish (final phase — full build + tests required) [domain: fullstack] → [subplan](./phase-9-packaging-polish.md)
@@ -68,7 +68,7 @@ parameter configurable.
 | Phase 3: Scraping | backend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 77/77 Infra tests | ✅ batch (e4d8476…686550d…+) |
 | Phase 4: Application + Workers | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ✅ Build OK + 202/202 tests | ✅ 2acbaa5 |
 | Phase 5: Host + Theme + i18n | frontend | ✅ Done | ⚠️ Pass with notes (Sonnet, combined batch) | ✅ Build OK + 11/11 UI tests | ✅ batch (e4d8476…686550d…+) |
-| Phase 6: Event browsing UI | frontend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
+| Phase 6: Event browsing UI | frontend | ✅ Done | ⬜ | ✅ Build OK + 228/228 tests | ⬜ |
 | Phase 7: Anomaly detection | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 8: Results loader | fullstack | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 9: Packaging + polish | fullstack | ⬜ Not Started | ⬜ | ⬜ | ⬜ |