feat(projects): flag re-rendered emails in the feed

Each email in the rollup now carries a 'stored' flag (rendered_html present).
Emails without an exact stored copy show an amber '≈ re-rendered' tag next to
Preview, so it's visible at a glance — not just inside the modal. en + de.

backend/src/services/projectService.js

@@ -255,12 +255,16 @@ async function getProjectOverview(id, perms = {}) {
           });
         }
       })
-      .select('id', 'recipient_email', 'email_type', 'status', 'created_at', 'sent_at', 'error_message', 'event_id')
+      .select('id', 'recipient_email', 'email_type', 'status', 'created_at', 'sent_at', 'error_message', 'event_id',
+        // Exact stored preview available? (CASE is cross-DB: SQLite→0/1, PG→int)
+        db.raw('CASE WHEN rendered_html IS NOT NULL THEN 1 ELSE 0 END as has_rendered'))
       .orderBy('created_at', 'desc')
       .limit(200);
     out.emails = emails.map((e) => ({
       id: e.id, recipient: e.recipient_email, type: e.email_type, status: e.status,
       queuedAt: e.created_at, sentAt: e.sent_at, error: e.error_message, eventId: e.event_id,
+      // false → the cockpit preview will re-render from the current template.
+      stored: !!Number(e.has_rendered),
     }));
   }
 

frontend/src/i18n/locales/de.json

@@ -3440,7 +3440,8 @@
       "retry": "Wiederholen",
       "previewTitle": "E-Mail-Vorschau",
       "noPreview": "Keine gespeicherte Vorschau für diese E-Mail — sie wurde gesendet, bevor Vorschauen erfasst wurden.",
-      "reRendered": "Neu gerendert aus der aktuellen Vorlage — diese E-Mail wurde gesendet, bevor Vorschauen erfasst wurden, und kann daher leicht von der tatsächlich versendeten abweichen."
+      "reRendered": "Neu gerendert aus der aktuellen Vorlage — diese E-Mail wurde gesendet, bevor Vorschauen erfasst wurden, und kann daher leicht von der tatsächlich versendeten abweichen.",
+      "reRenderedTag": "≈ neu gerendert"
     },
     "toast": {
       "created": "Projekt erstellt",

frontend/src/i18n/locales/en.json

@@ -3440,7 +3440,8 @@
       "retry": "Retry",
       "previewTitle": "Email preview",
       "noPreview": "No stored preview for this email — it was sent before previews were captured.",
-      "reRendered": "Re-rendered from the current template — this email was sent before previews were captured, so it may differ slightly from what the recipient received."
+      "reRendered": "Re-rendered from the current template — this email was sent before previews were captured, so it may differ slightly from what the recipient received.",
+      "reRenderedTag": "≈ re-rendered"
     },
     "toast": {
       "created": "Project created",

frontend/src/pages/admin/projects/ProjectCockpitPage.tsx

@@ -39,6 +39,7 @@ interface FeedItem {
   href?: string | null;
   emailId?: number;
   emailStatus?: string;
+  reRendered?: boolean;
 }
 
 /** Detail-page route for a clickable document, or null when there isn't one
@@ -153,7 +154,7 @@ export const ProjectCockpitPage: React.FC = () => {
         key: `email-${e.id}`, kind: 'email', date: e.sentAt || e.queuedAt,
         title: t(`projects.feed.email`, 'Email') + ` · ${e.type}`,
         subtitle: e.recipient + (e.error ? ` — ${e.error}` : ''),
-        status: e.status, emailId: e.id, emailStatus: e.status,
+        status: e.status, emailId: e.id, emailStatus: e.status, reRendered: !e.stored,
       });
     }
     for (const q of data.quotes) {
@@ -361,6 +362,14 @@ export const ProjectCockpitPage: React.FC = () => {
                           <button onClick={() => openPreview(item.emailId as number)} className="inline-flex items-center gap-1 text-xs text-primary-600 hover:underline">
                             <Eye className="w-3 h-3" />{t('projects.email.preview', 'Preview')}
                           </button>
+                          {item.reRendered && (
+                            <span
+                              title={t('projects.email.reRendered', 'Re-rendered from the current template — may differ slightly from what was sent.') as string}
+                              className="inline-block rounded-full px-2 py-0.5 text-xs bg-amber-100 dark:bg-amber-900/40 text-amber-700 dark:text-amber-300"
+                            >
+                              {t('projects.email.reRenderedTag', '≈ re-rendered')}
+                            </span>
+                          )}
                           {item.emailStatus === 'sent' && (
                             <button onClick={() => emailActionMutation.mutate({ action: 'resend', emailId: item.emailId as number })} className="inline-flex items-center gap-1 text-xs text-neutral-600 dark:text-neutral-300 hover:underline">
                               <Send className="w-3 h-3" />{t('projects.email.resend', 'Resend')}

frontend/src/services/projects.service.ts

@@ -47,6 +47,8 @@ export interface ProjectEmail {
   sentAt: string | null;
   error: string | null;
   eventId: number | null;
+  /** true = exact HTML stored at send time; false = preview re-rendered. */
+  stored: boolean;
 }
 
 export interface ProjectInvoice {