feat: add plugin ui.rerenderEmail API and restyle read-receipt banner

components/email/email-viewer.tsx

@@ -809,6 +809,15 @@ export function EmailViewer({
   const [pluginRenderedHtml, setPluginRenderedHtml] = useState<string | null>(null);
   const [pluginRenderedText, setPluginRenderedText] = useState<string | null>(null);
   const [pluginRenderedAttachments, setPluginRenderedAttachments] = useState<PostalMimeAttachment[]>([]);
+  // Bumped when a plugin calls `api.ui.rerenderEmail` (e.g. the S/MIME plugin
+  // after the user unlocks a key from the banner) to force the onRenderEmailBody
+  // hook to run again for the open message so the body re-decrypts.
+  const [pluginRenderNonce, setPluginRenderNonce] = useState(0);
+  useEffect(() => {
+    const bump = () => setPluginRenderNonce((n) => n + 1);
+    window.addEventListener('plugin:rerender-email', bump);
+    return () => window.removeEventListener('plugin:rerender-email', bump);
+  }, []);
 
   // TNEF (winmail.dat) support
   const [tnefHtml, setTnefHtml] = useState<string | null>(null);
@@ -1205,7 +1214,7 @@ export function EmailViewer({
     })();
 
     return () => { cancelled = true; };
-  }, [email]);
+  }, [email, pluginRenderNonce]);
 
   // TNEF (winmail.dat) detection and processing
   useEffect(() => {

components/email/read-receipt-banner.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useState } from 'react';
-import { MailCheck, Loader2, CheckCircle } from 'lucide-react';
+import { MailCheck, Loader2, CheckCircle, X } from 'lucide-react';
 import { useTranslations } from 'next-intl';
 
 interface ReadReceiptBannerProps {
@@ -17,43 +17,61 @@ export function ReadReceiptBanner({ requestedBy, onSend, onIgnore }: ReadReceipt
   const t = useTranslations('email_viewer.read_receipt');
   const [state, setState] = useState<'idle' | 'sending' | 'sent'>('idle');
 
+  // Matches the host's "External Content" banner row: a round tinted icon chip,
+  // an uppercase eyebrow, a foreground message, and neutral bordered actions.
   if (state === 'sent') {
     return (
-      <div className="flex items-center gap-2 rounded-md border border-border bg-muted/40 px-3 py-2 text-sm text-muted-foreground">
-        <CheckCircle className="w-4 h-4 text-green-600 dark:text-green-400 shrink-0" />
-        <span>{t('sent')}</span>
+      <div className="flex items-center gap-3 py-1">
+        <div className="w-10 h-10 rounded-full bg-success/15 text-success flex items-center justify-center flex-shrink-0 shadow-sm">
+          <CheckCircle className="w-5 h-5" />
+        </div>
+        <span className="text-sm text-muted-foreground">{t('sent')}</span>
       </div>
     );
   }
 
   return (
-    <div className="flex flex-wrap items-center gap-2 rounded-md border border-amber-300/60 bg-amber-50 px-3 py-2 text-sm dark:border-amber-700/50 dark:bg-amber-950/30">
-      <MailCheck className="w-4 h-4 shrink-0 text-amber-600 dark:text-amber-400" />
-      <span className="text-foreground">{t('prompt')}</span>
-      <span className="break-all text-muted-foreground">{requestedBy}</span>
-      <div className="ms-auto flex items-center gap-2">
-        <button
-          onClick={async () => {
-            setState('sending');
-            try {
-              await onSend();
-              setState('sent');
-            } catch {
-              setState('idle');
-            }
-          }}
-          disabled={state === 'sending'}
-          className="inline-flex items-center gap-1.5 rounded-md bg-green-600 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-green-700 disabled:cursor-not-allowed disabled:opacity-50"
-        >
-          {state === 'sending' && <Loader2 className="w-3 h-3 animate-spin" />}
-          {t('send')}
-        </button>
-        <button
-          onClick={onIgnore}
-          className="rounded-md bg-red-600 px-3 py-1.5 text-xs font-medium text-white transition-colors hover:bg-red-700"
-        >
-          {t('ignore')}
-        </button>
+    <div className="flex items-start gap-3 py-1">
+      <div className="w-10 h-10 rounded-full bg-info/15 text-info flex items-center justify-center flex-shrink-0 shadow-sm">
+        <MailCheck className="w-5 h-5" />
+      </div>
+      <div className="flex-1 min-w-0 space-y-2">
+        <div>
+          <div className="text-[10px] font-semibold uppercase tracking-wider text-muted-foreground">
+            Read receipt
+          </div>
+          <div className="text-sm font-medium text-foreground break-words">
+            {t('prompt')}
+          </div>
+          <div className="text-xs text-muted-foreground break-all">
+            Requested by <span className="text-foreground/80">{requestedBy}</span>
+          </div>
+        </div>
+        <div className="flex flex-wrap items-center gap-1.5 pt-0.5">
+          <button
+            onClick={async () => {
+              setState('sending');
+              try {
+                await onSend();
+                setState('sent');
+              } catch {
+                setState('idle');
+              }
+            }}
+            disabled={state === 'sending'}
+            className="inline-flex items-center gap-1.5 text-sm text-muted-foreground hover:text-foreground px-3 py-1.5 rounded-md border border-border hover:bg-muted transition-colors min-h-[36px] disabled:opacity-50 disabled:cursor-not-allowed"
+          >
+            {state === 'sending' ? <Loader2 className="w-3.5 h-3.5 animate-spin" /> : <MailCheck className="w-3.5 h-3.5" />}
+            {t('send')}
+          </button>
+          <button
+            onClick={onIgnore}
+            className="inline-flex items-center gap-1.5 text-sm text-muted-foreground hover:text-foreground px-3 py-1.5 rounded-md border border-border hover:bg-muted transition-colors min-h-[36px]"
+          >
+            <X className="w-3.5 h-3.5" />
+            {t('ignore')}
+          </button>
+        </div>
       </div>
     </div>
   );