feat: copy caption in post actions menu

components/social/post-card-menu.tsx

@@ -21,7 +21,7 @@
 
 import { useCallback, useEffect, useRef, useState } from "react";
 import { createPortal } from "react-dom";
-import { Ban, Flag, MoreVertical, Trash2 } from "lucide-react";
+import { Ban, Copy, Flag, MoreVertical, Trash2 } from "lucide-react";
 import { toast } from "sonner";
 import {
   Drawer,
@@ -41,6 +41,8 @@ import { useAuthGate } from "@/components/auth/auth-gate";
 import { useMediaQuery } from "@/components/selection-toolbar/shared";
 import { ConfirmModal } from "@/components/ui/confirm-modal";
 import { ReportDialog, type ReportOption } from "@/components/social/report-dialog";
+import { createShortLink } from "@/lib/share";
+import { structuredReferenceForPost } from "@/lib/source-reference";
 
 // Post report categories — mirrors the BFF allow-list (postReportCategories).
 const POST_REPORT_OPTIONS: ReportOption[] = [
@@ -147,10 +149,45 @@ export function PostCardMenu({
     };
   }, [open, isMobile]);
 
+  // Copy the post's caption + source citation + a (short) link to the post —
+  // the same payload the share sheet / footer produce. Available to every
+  // viewer.
+  async function copyCaption() {
+    setOpen(false);
+    try {
+      const origin = window.location.origin;
+      let url = "";
+      if (authorHandle) {
+        const longPath = `/u/${encodeURIComponent(authorHandle)}/posts#post-${post.id}`;
+        const code = await createShortLink(longPath);
+        url = code
+          ? new URL(`/share/${code}`, origin).toString()
+          : new URL(longPath, origin).toString();
+      }
+      const ref = structuredReferenceForPost(post.source_url, post.source_title);
+      const lines: string[] = [];
+      if (post.caption) lines.push(`“${post.caption}”`, "");
+      lines.push("Source:", ref.title);
+      if (ref.detail) lines.push(ref.detail);
+      if (url) lines.push(url);
+      await navigator.clipboard.writeText(lines.join("\n"));
+      toast.success("Caption copied");
+    } catch {
+      toast.error("Could not copy");
+    }
+  }
+
   // Build the items list AFTER all hooks have run so a conditional
   // early-return doesn't break the rules-of-hooks contract on
   // re-renders where viewer state changes.
   const items: MenuItem[] = [];
+  // Copy caption — first item for everyone (owner and non-owner alike).
+  items.push({
+    key: "copy",
+    label: "Copy caption",
+    icon: <Copy className="size-4" />,
+    onClick: copyCaption,
+  });
   if (isOwner) {
     if (onDelete) {
       items.push({