feat(terminal): a text drag (a Files/Changes row, a skill) is pasted into the pane

xterm.js has no drop handling of its own, so dropped text was lost; the pane
now pastes it as a local terminal does, with a "Drop to paste" hint.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/run/TerminalView.tsx

@@ -17,7 +17,7 @@
  * Files (images or any other) dropped or pasted on it — Ctrl+V included — are saved on the server
  * (`POST /api/run/drop-file`) and their PATHS pasted into the pane — what a
  * local terminal does on a drop, and how `claude` attaches an image or reads
- * a file. The pane also registers with
+ * a file. A text drag (a Files/Changes row, a skill) is pasted as its text. The pane also registers with
  * `lib/panePaste.ts`, so a diff-line comment from the Changes panel can be
  * pasted into whichever of the workspace's panes was focused last.
  * Keyboard: the terminal keeps Tab and Shift+Tab (claude cycles its permission
@@ -63,7 +63,7 @@ import { notePaneFocus, registerPane } from "../../lib/panePaste";
 import { attachImeInput } from "../../lib/imeInput";
 import { TERMINAL_FONTS, readTerminalFont } from "../../lib/terminalFont";
 
-type DropState = "hint" | "uploading" | "failed";
+type DropState = "hint" | "paste" | "uploading" | "failed";
 
 /** localStorage flag for xterm's screen-reader mode (a Settings toggle can set it later). */
 export const SCREEN_READER_KEY = "agenthub.terminal.screenReader";
@@ -134,6 +134,10 @@ export function loadXterm(): Promise<Xterm> {
 const RETRY_MIN_MS = 1500;
 const RETRY_MAX_MS = 30_000;
 const hasFiles = (e: DragEvent) => Array.from(e.dataTransfer.types).includes("Files");
+/** A text drag (a Files/Changes row, a skill, selected text): xterm.js has no
+ *  drop handling of its own, so the pane pastes it, as a local terminal does. */
+const hasText = (e: DragEvent) =>
+  !hasFiles(e) && Array.from(e.dataTransfer.types).includes("text/plain");
 
 interface TerminalViewProps {
   runId: string;
@@ -200,7 +204,16 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
   const ctrlVRef = useRef(false);
 
   const onDrop = (e: DragEvent) => {
-    if (!hasFiles(e)) return; // dragged text keeps xterm's own handling
+    if (hasText(e)) {
+      e.preventDefault();
+      dragDepth.current = 0;
+      setDrop(null);
+      const text = e.dataTransfer.getData("text/plain");
+      if (text) termRef.current?.paste(text + " ");
+      termRef.current?.focus();
+      return;
+    }
+    if (!hasFiles(e)) return;
     e.preventDefault();
     dragDepth.current = 0;
     void attachFiles(Array.from(e.dataTransfer.files));
@@ -673,20 +686,20 @@ export function TerminalView({ runId, wsBaseUrl, onExit, autoFocus = true }: Ter
       className="relative h-full w-full pb-1 pl-3 pr-1 pt-1.5"
       style={{ backgroundColor: palette.background }}
       onDragEnter={(e) => {
-        if (!hasFiles(e)) return;
+        if (!hasFiles(e) && !hasText(e)) return;
         e.preventDefault();
         dragDepth.current += 1;
-        setDrop("hint");
+        setDrop(hasFiles(e) ? "hint" : "paste");
       }}
       onDragOver={(e) => {
-        if (!hasFiles(e)) return;
+        if (!hasFiles(e) && !hasText(e)) return;
         e.preventDefault(); // without it the browser refuses the drop
         e.dataTransfer.dropEffect = "copy";
       }}
       onDragLeave={(e) => {
-        if (!hasFiles(e)) return;
+        if (!hasFiles(e) && !hasText(e)) return;
         dragDepth.current = Math.max(0, dragDepth.current - 1);
-        if (dragDepth.current === 0) setDrop((d) => (d === "hint" ? null : d));
+        if (dragDepth.current === 0) setDrop((d) => (d === "hint" || d === "paste" ? null : d));
       }}
       onDrop={onDrop}
       onPasteCapture={onPaste}

client/src/components/run/__tests__/TerminalView.test.tsx

@@ -512,6 +512,23 @@ describe("TerminalView", () => {
     );
   });
 
+  it("pastes the text of a dragged Files-panel row, uploading nothing", () => {
+    dropFileMock.mockReset();
+    pasteMock.mockClear();
+    render(<TerminalView runId="r1" wsBaseUrl="ws://x" />);
+    const data: Record<string, string> = {
+      "application/x-agenthub-attach": '{"path":"@src/a.ts","name":"a.ts"}',
+      "text/plain": "src/a.ts",
+    };
+    const dataTransfer = { types: Object.keys(data), files: [], getData: (k: string) => data[k] ?? "" };
+    fireEvent.dragEnter(screen.getByTestId("terminal-view"), { dataTransfer });
+    expect(screen.getByTestId("terminal-drop")).toHaveTextContent("Drop to paste into the terminal");
+    fireEvent.drop(screen.getByTestId("terminal-view"), { dataTransfer });
+    expect(pasteMock).toHaveBeenCalledWith("src/a.ts ");
+    expect(screen.queryByTestId("terminal-drop")).toBeNull();
+    expect(dropFileMock).not.toHaveBeenCalled();
+  });
+
   it("uploads a pasted image and pastes its path, like a drop", async () => {
     dropFileMock.mockReset().mockResolvedValue({ path: "/tmp/agenthub-drops-1/ab-image.png" });
     pasteMock.mockClear();

client/src/i18n/locales/en/run.json

@@ -65,6 +65,7 @@
   },
   "drop": {
     "hint": "Drop files or images to attach",
+    "paste": "Drop to paste into the terminal",
     "uploading": "Uploading…",
     "failed": "Could not attach the file",
     "remove": "Remove attachment",

client/src/i18n/locales/vi/run.json

@@ -65,6 +65,7 @@
   },
   "drop": {
     "hint": "Thả file hoặc ảnh để đính kèm",
+    "paste": "Thả để dán vào terminal",
     "uploading": "Đang tải lên…",
     "failed": "Không đính kèm được file",
     "remove": "Bỏ đính kèm",