feat(dashboard): doctor dashboard with red zones, patient card, live alerts and patient connect

- Patient list sorted red -> yellow -> grey -> green with KPI row, trend arrows,
  7-day adherence bars, discontinuation-risk badge with factor tooltip.
- Patient card: scales with severity bands from config/scales (unscheduled marked),
  mood/sleep/alcohol small multiples, dose heat-strip, alerts feed with ack,
  safety plan, AI summary with disclaimer.
- Live alerts: st.fragment(run_every=2.5s) polling, toast + pinned acute banner on
  every page; full rerun on new alert only on doctor pages.
- Connect form -> POST /patients/connect -> code, QR, deep link.
- Thin httpx ApiClient over the frozen schemas with graceful "API недоступен".
- app.py discovers dashboard/pages/*.py automatically (st.navigation); demo pages
  of #17 plug in by adding a file.

Refs #16

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dashboard/components/live_alerts.py

@@ -0,0 +1,85 @@
+"""Live alerts across all pages: polls the API every few seconds, toasts new alerts, pins open acute ones on top.
+
+Uses the built-in `st.fragment(run_every=...)`: only this fragment re-runs on the timer, the page is untouched
+unless a new alert arrives on a doctor page (then the whole app reruns so the list and the card pick it up).
+"""
+
+from __future__ import annotations
+
+from html import escape
+
+import streamlit as st
+
+from app.api.schemas import AlertOut
+from dashboard import theme
+from dashboard.api_client import ApiError
+from dashboard.components import helpers as h
+from dashboard.components import state, ui
+
+POLL_SECONDS = 2.5
+MAX_BANNER = 3
+
+
+def _toast(a: AlertOut) -> None:
+    icon = theme.TONES[h.level_tone(a.level)].icon
+    st.toast(f"**{a.patient_name}** — {a.reason}", icon=icon, duration="long" if a.level == "acute" else "short")
+
+
+def flush_pending_toasts() -> None:
+    """Toasts queued right before a full-app rerun are shown on the next run (a rerun drops pending deltas)."""
+    for a in st.session_state.pop("pending_toasts", []):
+        _toast(a)
+
+
+def _banner(acute: list[AlertOut]) -> None:
+    for a in acute[:MAX_BANNER]:
+        left, right = st.columns([8, 1.6], vertical_alignment="center")
+        with left:
+            st.html(
+                ui.banner(
+                    f"<b>Кризисный сигнал · {escape(a.patient_name)}</b> — {escape(a.reason)}"
+                    f'<div style="font-size:.8rem;margin-top:2px">{escape(h.when_label(a.ts))} · '
+                    "по протоколу — связаться с пациентом сегодня</div>",
+                    tone="red",
+                    pulse=True,
+                )
+            )
+        with right:
+            if st.button(
+                "Карточка", key=f"acute-open-{a.id}", type="primary", icon=":material/arrow_forward:", width="stretch"
+            ):
+                st.switch_page(state.PATIENTS_PAGE, query_params={"patient": a.token})
+    if len(acute) > MAX_BANNER:
+        st.caption(f"Ещё кризисных сигналов: {len(acute) - MAX_BANNER}")
+
+
+def render(*, rerun_app_on_new: bool = True) -> None:
+    """Place once per run (app.py does it above every page)."""
+
+    @st.fragment(run_every=POLL_SECONDS)
+    def _poll() -> None:
+        ss = st.session_state
+        try:
+            alerts = state.client().alerts(open_only=True)
+        except ApiError:
+            return  # pages show their own "API недоступен" banner; the poller just retries next tick
+        acked = state.local_acks()
+        alerts = [a for a in alerts if a.acked_at is None and a.id not in acked]
+
+        seen: set[int] | None = ss.get("seen_alert_ids")
+        if seen is None:
+            # First poll of the session: what is already open is not "new" — no toast storm on page load.
+            ss["seen_alert_ids"] = {a.id for a in alerts}
+            new: list[AlertOut] = []
+        else:
+            new = h.split_new(alerts, seen)
+            seen.update(a.id for a in new)
+
+        if new and rerun_app_on_new:
+            ss["pending_toasts"] = ss.get("pending_toasts", []) + new
+            st.rerun(scope="app")
+        for a in new:
+            _toast(a)
+        _banner(h.sort_alerts(a for a in alerts if a.level == "acute"))
+
+    _poll()