fix(web): keep pasted link text when the clipboard also carries an image

apps/web/src/components/ComposerPromptEditor.tsx

@@ -868,6 +868,7 @@ export interface ComposerPromptEditorHandle {
   focus: () => void;
   focusAt: (cursor: number) => void;
   focusAtEnd: () => void;
+  insertText: (text: string) => void;
   readSnapshot: () => {
     value: string;
     cursor: number;
@@ -1691,9 +1692,19 @@ function ComposerPromptEditorInner({
           ),
         );
       },
+      insertText: (text: string) => {
+        editor.update(() => {
+          const selection = $getSelection();
+          if ($isRangeSelection(selection)) {
+            selection.insertRawText(text);
+            return;
+          }
+          $getRoot().selectEnd().insertRawText(text);
+        });
+      },
       readSnapshot,
     }),
-    [focusAt, readSnapshot],
+    [editor, focusAt, readSnapshot],
   );
 
   const handleEditorChange = useCallback((editorState: EditorState) => {

apps/web/src/components/chat/ChatComposer.tsx

@@ -273,6 +273,17 @@ function isInsideComposerFloatingLayer(element: Element): boolean {
   return element.closest(COMPOSER_FLOATING_LAYER_SELECTOR) !== null;
 }
 
+/** A pasted link the user meant to keep, as opposed to accessory clipboard text. */
+function isHttpUrlText(text: string): boolean {
+  if (!/^https?:\/\//i.test(text)) return false;
+  try {
+    const url = new URL(text);
+    return url.protocol === "http:" || url.protocol === "https:";
+  } catch {
+    return false;
+  }
+}
+
 const ComposerFooterModeControls = memo(function ComposerFooterModeControls(props: {
   showInteractionModeToggle: boolean;
   interactionMode: ProviderInteractionMode;
@@ -2392,6 +2403,16 @@ export const ChatComposer = memo(function ChatComposer(props: ChatComposerProps)
     if (imageFiles.length === 0) return;
     event.preventDefault();
     void addComposerImages(imageFiles);
+    // Copying a link from a browser or chat app often puts the URL text and a
+    // preview image on the clipboard together. preventDefault above suppresses
+    // the native text insertion, so re-insert the text half instead of
+    // silently dropping it with the attachment. Only URL-shaped text
+    // qualifies: OS file copies and image copies can carry accessory
+    // text/plain (file names, local paths) the user never meant to insert.
+    const text = event.clipboardData.getData("text/plain").trim();
+    if (isHttpUrlText(text)) {
+      composerEditorRef.current?.insertText(text);
+    }
   };
 
   const onComposerDragEnter = (event: React.DragEvent<HTMLDivElement>) => {