Patients page, clinical Settings re-theme, Polar-style user footer

- Patients: new /patients directory table (name, MRN, age·sex, status,
  last seen, allergies) with search + Add patient; clicking a row opens
  the record in the chat via /?patient=<#>. chat-panel reads that search
  param (Suspense-wrapped) and runs the lookup once on arrival. Sidebar
  "Patients" now links to /patients; lib/patients gains listPatients().
- Settings: re-themed to clinical tabs (Profile · Records · Signing ·
  Care team · Developers) — clinician profile, patient notifications,
  patient-owned-storage/signed-records features, and a Signing key panel.
  Same layout/components, only content changed.
- Sidebar footer: Polar-style NavUser (avatar + name + chevron) opening a
  menu upward — Settings · Docs & GitHub · Theme · Log out. Collapsed
  ("locked"): avatar only, name on hover (tooltip), menu opens to the
  right. Placeholder identity (no auth yet).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/app/(app)/page.tsx

@@ -1,10 +1,15 @@
+import { Suspense } from "react";
+
 import { SidebarInset } from "@/components/ui/sidebar";
 import { ChatPanel } from "@/components/chat/chat-panel";
 
 export default function Home() {
   return (
     <SidebarInset className="flex flex-1 flex-col overflow-hidden">
-      <ChatPanel />
+      {/* ChatPanel reads the `?patient=` search param, so it needs a Suspense boundary. */}
+      <Suspense>
+        <ChatPanel />
+      </Suspense>
     </SidebarInset>
   );
 }

frontend/app/(app)/patients/page.tsx

@@ -0,0 +1,10 @@
+import { SidebarInset } from "@/components/ui/sidebar";
+import { PatientsView } from "@/components/patients/patients-view";
+
+export default function PatientsPage() {
+  return (
+    <SidebarInset className="flex flex-1 flex-col overflow-y-auto">
+      <PatientsView />
+    </SidebarInset>
+  );
+}