feat: share post to other apps

components/selection-toolbar/compose-post.tsx

@@ -17,6 +17,7 @@ import { createPortal } from "react-dom";
 import { useRouter } from "next/navigation";
 import Image from "next/image";
 import { X, ImagePlus, Trash2, Send } from "lucide-react";
+import { toast } from "sonner";
 import {
   Drawer,
   DrawerContent,
@@ -26,6 +27,7 @@ import {
 import { posts, SocialError } from "@/lib/social";
 import { buildHighlightUrl } from "@/lib/text-highlight";
 import { getSourceReference } from "@/lib/source-reference";
+import { useSharePost } from "@/components/social/share-post-provider";
 
 const MAX_IMAGES = 5;
 const PRESS_IMAGE_TYPES = "image/png,image/jpeg,image/webp,image/gif";
@@ -44,6 +46,7 @@ export function ComposePost({
   onPosted?: () => void;
 }) {
   const router = useRouter();
+  const { openShareSheet } = useSharePost();
   const fileInput = useRef<HTMLInputElement>(null);
   const [images, setImages] = useState<{ url: string; uploading: boolean }[]>(
     [],
@@ -108,7 +111,7 @@ export function ComposePost({
         : typeof document !== "undefined"
           ? document.title
           : "";
-      await posts.create({
+      const newPost = await posts.create({
         caption: selectedText,
         source_url: sourceURL,
         source_title: sourceTitle,
@@ -119,6 +122,19 @@ export function ComposePost({
       onPosted?.();
       onClose();
       router.refresh();
+      // Success feedback + offer to externally share. The BFF's Create
+      // response doesn't include author info (no JOIN with users), but
+      // SharePostSheet falls back to the authed user's handle when
+      // post.author_handle is missing — perfect for a freshly-created
+      // post since the creator IS the auth user.
+      toast.success("Posted to your feed", {
+        description: "Want to share it to other apps?",
+        action: {
+          label: "Share",
+          onClick: () => openShareSheet(newPost),
+        },
+        duration: 5000,
+      });
     } catch (err) {
       if (err instanceof SocialError && err.status === 401) {
         setError("Please log in to post.");