feat: email provider, admin password reset, portal new-patient, chat pill

Chat: history pill now shows a History icon + a Start-new-chat (SquarePen)
button; removed the duplicate chat-history list from the sidebar.

Email: deployment-wide email provider config (Resend/Postmark/SendGrid/SMTP) in
Settings → Developers, with encrypted API key and a Send-test action. sendEmail
dispatches via the chosen provider (REST via fetch; SMTP via nodemailer).

Forgot password with no provider: alert the clinic admin(s) via a "System"
message card in Messages + a bell notification (seeded system user + per-clinic
System conversation); clicking deep-links to /settings?tab=careTeam&member=<id>.
Admins can set a member's password directly from the employee dialog
(PATCH /api/staff/:id/password via Better Auth's internal context — no admin
plugin needed).

Patient Portal: "New patient" booking path registers a demographics-only patient
then books; bookings reject double-booked slots (409).

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

frontend/components/chat/chat-history-panel.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { PanelLeft, Plus, Search, Trash2 } from "lucide-react";
+import { History, Plus, Search, SquarePen, Trash2 } from "lucide-react";
 import { useRouter, useSearchParams } from "next/navigation";
 import { type MouseEvent, useEffect, useMemo, useState } from "react";
 import { useTranslation } from "react-i18next";
@@ -78,15 +78,15 @@ export function ChatHistoryPanel() {
           onClick={() => setOpen(true)}
           type="button"
         >
-          <PanelLeft className="size-4" />
+          <History className="size-4" />
         </button>
         <button
-          aria-label={t("chat.history.search")}
+          aria-label={t("chat.history.startNew")}
           className="flex size-7 items-center justify-center rounded-full text-muted-foreground transition-colors hover:bg-accent hover:text-foreground"
-          onClick={() => setOpen(true)}
+          onClick={() => router.push("/")}
           type="button"
         >
-          <Search className="size-4" />
+          <SquarePen className="size-4" />
         </button>
       </div>