fix: Replay controls

docs/clinical-testing-guide.md

@@ -110,7 +110,7 @@ Use the sidebar (desktop) or bottom navigation (mobile) to move between screens.
 | **Sepsis bundle** | If sepsis was suspected — four time-critical elements and compliance status |
 | **Vital sign charts** | Trends for HR, RR, systolic BP, SpO₂, temperature |
 | **NEWS2 history** | How the early warning score changed over time |
-| **Replay controls** | Local timeline bar (pause, speed, **Next Alert →**) to step through the case |
+| **Replay controls** | Local timeline bar (pause, speed, **Next Alert →**) — scrubs charts/vitals to a point in time; does not control the simulator |
 
 **What to notice:** Would you trust these charts and explanations during a real handoff? Is anything missing?
 
@@ -271,7 +271,7 @@ Use this during or after your session.
 - [ ] Vital sign charts show sensible trends
 - [ ] NEWS2 history chart updates over time
 - [ ] Sepsis bundle panel appears when sepsis alerts fire
-- [ ] **Next Alert →** scrolls to review section and selects alerts
+- [ ] **Next Alert →** selects each open alert, scrubs charts to that time, and scrolls the review section into view
 
 ### Alert Center
 - [ ] Open / Acknowledged / Resolved tabs filter correctly
@@ -330,7 +330,7 @@ No. Rate any alert in any status.
 *Useful* = good alert clinically. *Would act* = you would specifically change care because of it. An alert can be useful information but not change your plan — use the button that best matches your reasoning.
 
 **The replay bar doesn’t pause the simulator.**  
-Correct — replay controls only scrub data already loaded in the browser. The facilitator controls simulator speed separately.
+Correct — replay controls scrub observation/chart data already loaded in the browser (pause, speed, and **Next Alert →** move a local timeline). The facilitator controls simulator speed separately.
 
 **Dark mode?**  
 Toggle in the header if your eyes prefer it; all screens support dark mode.

docs/dashboard-guide.md

@@ -197,13 +197,17 @@ Five **vital sign trend** line charts (Chart.js via `vue-chartjs`):
 
 #### Replay controls
 
-Local playback UI for reviewing scenario timelines:
+Local playback UI for reviewing scenario timelines against data already loaded for this encounter:
 
-- Pause / resume, speed presets (1×, 60×, 360×, Instant)
-- Progress bar and elapsed time display
-- **Next Alert →** cycles through open alerts chronologically, selects each for reasoning, and scrolls to the chart section
+- **Pause / resume** — starts paused at the end of the timeline (all data visible). Resume rewinds to the start and plays forward.
+- **Speed presets** (1×, 60×, 360×, Instant) — advance the replay clock through observation and NEWS2 timestamps; **Instant** jumps to the end.
+- **Progress bar and elapsed time** — derived from the earliest to latest timestamp across observations, NEWS2 history, and alerts.
+- **Chart scrubbing** — vitals panel, vital trend charts, and NEWS2 history show only data at or before the replay clock.
+- **Next Alert →** — cycles open/escalated alerts chronologically, selects each for the reasoning panel, scrubs the replay clock to that alert’s `triggeredAt`, scrolls the alert row into view, and scrolls to the chart section.
 
-> Replay state is **client-side only**. It does not send commands to the simulator.
+Selecting an alert row in **Active Alerts** also scrubs the replay clock to that alert’s time.
+
+> Replay state is **client-side only**. It does not send commands to the simulator. Patient detail loads encounter-scoped alerts on every poll so the alert list and **Next Alert →** are not affected by a prior visit to Alert Center.
 
 Patient detail data polls every **5 seconds**.
 
@@ -232,7 +236,7 @@ Typical demo flow:
 2. Replay a scenario at moderate speed (`--speed 60`).
 3. Open **Virtual Ward** — new or updated encounters appear as the simulator creates them.
 4. Click the patient — watch vitals and charts fill in as observations ingest.
-5. When alerts fire, click an alert row to read reasoning; try **Next Alert →** on the replay bar.
+5. When alerts fire, click an alert row to read reasoning (replay scrubs to that time); try **Next Alert →** on the replay bar.
 6. Use **Alert Center** to acknowledge alerts globally.
 
 **Suggested scenarios:**
@@ -305,6 +309,8 @@ Implementation plans: `docs/plans/phase-17-plan.md` (ward shell + detail), `docs
 | Blank ward / network errors in console | API not running or wrong URL | Start API; check `VITE_API_URL` |
 | CORS error in browser | Dashboard origin not allowed | Add origin to API `DashboardOptions` in `appsettings.json` |
 | Charts crash on mount | Chart data not unwrapped | Ensure `VitalTrendChart` wrapper is used (see `TrendsGrid.vue`) |
+| Replay bar stuck at 0:00 | No timestamped data yet | Wait for observations/alerts to load; bounds sync after first fetch |
+| Next Alert shows wrong patient | Stale global alert store | Fixed in Patient Detail — encounter alerts reload on mount/poll |
 | No patients listed | No active encounters | Run simulator or use seeded API data |
 | NEWS2 chart empty | Scores not computed yet | Wait for Kafka `news2-scoring` consumer after observations ingest |
 | Acknowledge fails 400 | Invalid clinician ID | Set `clinicianId` in localStorage or settings store |