L7 Offline & PWA: Outbox-Kern, IndexedDB-Store, Sync-Engine und Bundle-Logik

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/lib/offline/drafts.ts

@@ -0,0 +1,42 @@
+import { getOfflineStore } from "./db";
+import { getOfflineState, whenReady } from "./outbox";
+import { ctxKeyOf } from "./types";
+
+/**
+ * Form drafts in IndexedDB (lane L7, Spec §22 "automatische Zwischenspeicherung"): note text,
+ * report draft … Stored per tenant+user context, deleted with the local data on logout.
+ * `key` is a stable form id, e.g. `note:<workOrderId>` or `report:<workOrderId>:daily`.
+ */
+
+const metaKey = (key: string) => `draft:${key}`;
+
+export async function loadDraft<T>(key: string): Promise<T | null> {
+  if (!(await whenReady())) return null;
+  const ctx = getOfflineState().ctx;
+  if (!ctx) return null;
+  try {
+    return await (await getOfflineStore()).getMeta<T>(ctxKeyOf(ctx), metaKey(key));
+  } catch {
+    return null;
+  }
+}
+
+export async function saveDraft(key: string, value: unknown): Promise<void> {
+  const ctx = getOfflineState().ctx;
+  if (!ctx) return;
+  try {
+    await (await getOfflineStore()).setMeta(ctxKeyOf(ctx), metaKey(key), value);
+  } catch {
+    // quota / private mode — the form keeps working without a draft
+  }
+}
+
+export async function clearDraft(key: string): Promise<void> {
+  const ctx = getOfflineState().ctx;
+  if (!ctx) return;
+  try {
+    await (await getOfflineStore()).deleteMeta(ctxKeyOf(ctx), metaKey(key));
+  } catch {
+    /* ignore */
+  }
+}