Merge pull request '[READY][SPA][P14] Issue #200: host/player phase-sync artifact' (#212) from feat/issue-200-spa-phase-sync-artifact into main
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docs/ISSUE-200-SPA-HOST-PLAYER-PHASE-SYNC-ARTIFACT.md
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docs/ISSUE-200-SPA-HOST-PLAYER-PHASE-SYNC-ARTIFACT.md
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# Issue #200 Artifact — SPA host→player phase sync (no reload)
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## Scope
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Acceptance for `[READY][SPA][P14] Gameplay MVP-del 5`:
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1. Host handlinger (`start round` / `næste fase`) propagere korrekt til player-ruter i SPA.
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2. Happy-path artefakt for én fuld faseovergang uden page reload.
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3. Sync-fejl giver kontrolleret fallback/error state.
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Afgrænsning overholdt: ingen nye spilregler og ingen redesign af backend event-model.
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## Happy-path faseovergang (uden page reload)
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Reference-flow i Angular shell:
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1. **Host starter runde/fase**
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- Host action kalder backend endpoint (`POST /lobby/sessions/:code/start` eller fase-endpoint)
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- Host shell hydrerer session igen (`GET /lobby/sessions/:code`)
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- Host route synkes via hash-rewrite i samme SPA shell:
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- `#/host/<phase>/<CODE>`
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- Implementeret i `HostShellComponent.syncRouteFromSession()`
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2. **Player modtager ny fase via state sync**
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- Player shell kører periodisk session-refresh (3s), uden hard reload
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- Når `session.status` ændrer sig, synkes hash-route i samme SPA shell:
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- `#/player/<phase>/<CODE>`
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- Implementeret i `PlayerShellComponent.syncRouteFromSession()`
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3. **Ingen page reload**
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- Routing sker med `window.history.replaceState(...)`
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- URL opdateres i eksisterende SPA instans (ingen template-hop, ingen full refresh)
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## Kontrolleret fallback ved sync-fejl
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Når player-sync fejler (netværk/fetch/session-refresh):
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- UI går i kontrolleret connection-state:
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- `reconnecting` ved online netværksfejl
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- `offline` når browser rapporterer offline
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- Fejl vises med retry/back-to-join handlinger
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- Reconnect forsøges igen via timer (`scheduleReconnect`) uden at crashe shell
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## Verifikation (tests)
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Kørt i `frontend/angular` med Vitest:
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- `src/app/features/host/host-shell.component.spec.ts`
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- Verificerer host-faseflow og hash-route sync uden reload
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- `src/app/features/player/player-shell.component.spec.ts`
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- Verificerer periodisk player state sync + hash-route sync
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- Verificerer reconnect/offline fallback ved sync-fejl
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- `src/app/api-contract-smoke.spec.ts`
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- `src/app/session-route-context.spec.ts`
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Kommando:
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```bash
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npm test -- --reporter=dot
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```
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Resultat: **4/4 testfiler grønne, 22/22 tests bestået**.
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