fix: reschedule via delete+recreate, sort posts chrono, show account name

- Reschedule: Postiz public API v1 has no PUT/PATCH on posts; implement
  as delete + recreate with updated date and same content/integrations
- Posts list: sort ascending by publishDate so nearest post appears first
- PostCard footer: show integration name (or identifier) before the
  timestamp, truncated to 2 accounts with +N overflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

artifacts/postiz-mobile/app/(tabs)/posts.tsx

@@ -86,10 +86,15 @@ export default function PostsScreen() {
     staleTime: 0,
   });
 
-  const filteredPosts =
-    filter === "all"
-      ? posts ?? []
-      : (posts ?? []).filter((p) => p.state === filter);
+  const filteredPosts = useMemo(() => {
+    const list =
+      filter === "all"
+        ? posts ?? []
+        : (posts ?? []).filter((p) => p.state === filter);
+    return [...list].sort(
+      (a, b) => new Date(a.publishDate).getTime() - new Date(b.publishDate).getTime()
+    );
+  }, [posts, filter]);
 
   const handleRefresh = async () => {
     setRefreshing(true);
@@ -152,8 +157,19 @@ export default function PostsScreen() {
 
   const submitReschedule = async (post: PostizPost, date: Date) => {
     if (!client) return;
+    const integrations = post.integrations ?? (post.integration ? [post.integration] : []);
     try {
-      await client.put(`posts/${post.id}`, { date: date.toISOString() });
+      await client.delete(`posts/${post.id}`);
+      await client.post("posts", {
+        type: "schedule",
+        date: date.toISOString(),
+        shortLink: false,
+        tags: [] as string[],
+        posts: integrations.map((intg) => ({
+          integration: { id: intg.id },
+          value: [{ content: post.content, image: post.image ?? [] }],
+        })),
+      });
       queryClient.invalidateQueries({ queryKey: ["posts-list"] });
       Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
       Alert.alert("Rescheduled", `Post moved to ${date.toLocaleDateString("en-US", { month: "short", day: "numeric", hour: "2-digit", minute: "2-digit" })}`);