feat: platform backbone and field capture, first part (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), reviewed tasks:
- run roles api/worker/job/all with shared startup checks (Task 1)
- schema and migration for DomainEvent, deliveries, JobRun, ThrottlerHit (Task 2)
- audit, notifications and domain events written in the same transaction (Task 3)
- dispatcher with SKIP LOCKED claims, retries and stale release (Task 4)
- worker building blocks: tick, LISTEN/NOTIFY wake-up, health (Task 5)
- worker process and entry points (Task 6)
- throttler counters in Postgres (Task 19)
- separate keys per purpose with key ring (Task 20)
- public origin page without exact location (Task 22)
- shop keys split into read and write (Task 23)
- Kustomize base, components, overlay encry, CI validation (Task 26)

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), reviewed tasks:
- brood frames, read endpoints, apiary overview and offline pack
- network basics, offline queue v3, navigation sheets, form building blocks
- new inspection with last-time hints and weather, varroa per day,
  treatment prefill, apiary page with round
- inspection photo (Task 10) is implemented, review pending

Not rolled out. Remaining tasks follow in later commits.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Frontend/src/app/(app)/layout.tsx

@@ -1,12 +1,13 @@
 "use client";
 
-import { ReactNode, useEffect } from "react";
+import { ReactNode, useEffect, useRef } from "react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { Hexagon } from "lucide-react";
 import { useAuth } from "@/lib/auth/auth-context";
+import { purgeStaleDraftPhotos } from "@/lib/photos/store";
 import { NotificationBell } from "@/components/notification-bell";
-import { OfflineSyncBadge } from "@/components/offline-sync-badge";
+import { OfflineBand } from "@/components/offline/offline-band";
 import { UserAvatar } from "@/components/user-avatar";
 import {
   DropdownMenu,
@@ -19,12 +20,14 @@ import {
 } from "@/components/ui/dropdown-menu";
 import { Sidebar } from "./sidebar";
 import { BottomNav } from "./bottom-nav";
-import { QuickAddMenu } from "./quick-add-menu";
+import { QuickAddSheet } from "./quick-add-sheet";
 import { PageTransition } from "./page-transition";
 
 export default function AppLayout({ children }: { children: ReactNode }) {
   const router = useRouter();
   const { user, isLoading, logout } = useAuth();
+  // Focus lands here when the offline queue sheet closes and nothing else is left.
+  const pageContentRef = useRef<HTMLDivElement>(null);
 
   useEffect(() => {
     if (!isLoading && !user) {
@@ -32,6 +35,12 @@ export default function AppLayout({ children }: { children: ReactNode }) {
     }
   }, [isLoading, user, router]);
 
+  // Photos of form drafts nobody can restore any more (older than 3 days)
+  // leave the device. Housekeeping only: if it fails, the next start tries again.
+  useEffect(() => {
+    void purgeStaleDraftPhotos(Date.now()).catch(() => undefined);
+  }, []);
+
   if (isLoading || !user) {
     return null;
   }
@@ -57,7 +66,7 @@ export default function AppLayout({ children }: { children: ReactNode }) {
             ApiCore
           </Link>
           <div className="flex shrink-0 items-center gap-2 text-sm">
-            <OfflineSyncBadge />
+            <QuickAddSheet user={user} variant="header" />
             <NotificationBell />
             <DropdownMenu>
               <DropdownMenuTrigger className="rounded-full">
@@ -85,12 +94,17 @@ export default function AppLayout({ children }: { children: ReactNode }) {
             </DropdownMenu>
           </div>
         </header>
-        <div className="flex-1 pb-(--bottom-nav-height) sm:pb-(--safe-area-bottom)">
+        <OfflineBand userId={user.id} pageContentRef={pageContentRef} />
+        <div
+          ref={pageContentRef}
+          tabIndex={-1}
+          className="flex-1 pb-(--bottom-nav-height) outline-none sm:pb-(--safe-area-bottom)"
+        >
           <PageTransition>{children}</PageTransition>
         </div>
       </div>
-      <BottomNav />
-      <QuickAddMenu />
+      <BottomNav user={user} />
+      <QuickAddSheet user={user} variant="fab" />
     </div>
   );
 }