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>

backend/src/auth.ts

@@ -35,10 +35,25 @@ export const auth = betterAuth({
     maxPasswordLength: 256,
     revokeSessionsOnPasswordReset: true,
     sendResetPassword: async ({ user, url }) => {
-      await sendEmail({
-        to: user.email,
-        subject: "Reset your temetro password",
-        text: `Reset your password by opening this link:\n\n${url}\n\nIf you didn't request this, you can ignore this email.`,
+      // With a provider configured, email the reset link. Otherwise fall back to
+      // alerting the clinic admin(s) so they can set a new password (dynamic
+      // imports keep the Better Auth CLI's static graph minimal at generate time).
+      const { isEmailConfigured } = await import("./services/email-config.js");
+      if (await isEmailConfigured()) {
+        await sendEmail({
+          to: user.email,
+          subject: "Reset your temetro password",
+          text: `Reset your password by opening this link:\n\n${url}\n\nIf you didn't request this, you can ignore this email.`,
+        });
+        return;
+      }
+      const { notifyAdminsPasswordReset } = await import(
+        "./services/auth-fallback.js"
+      );
+      await notifyAdminsPasswordReset({
+        id: user.id,
+        name: user.name,
+        email: user.email,
       });
     },
   },