chore: v2.8.12 — clone queue and progress, session defaults, chat agents, drops as @ mentions

Whole tree from parallel sessions, plus the version bump:
- Clone: a queue with live progress (Add workspace and extra folders),
  clones run under nice/ionice so the machine stays responsive.
- Settings → AI tools → Session defaults: a new session's default
  permission mode / bypass per account.
- Chat lists the background subagents that have not reported back yet.
- A file pasted or dropped into a claude pane goes in as an @ mention.
- Changes panel: say why amend/undo is refused on a pushed commit.
- openapi.yaml regenerated (Artifacts, Host, resumeById).

client/src/components/run/PaneChat.tsx

@@ -476,7 +476,10 @@ export const PaneChat = memo(function PaneChat({
 
   // Stable, so typing in the prompt box does not re-render the conversation
   // (ConversationView is memoized).
-  const openTerminal = useCallback(() => showTerminal(runId, sessionId), [runId, sessionId]);
+  const openTerminal = useCallback(
+    () => showTerminal(runId, sessionId, run.tool),
+    [runId, sessionId, run.tool]
+  );
   const openFile = useCallback(
     (named: string) => {
       // A relative path in a reply (`server/lib/x.js`) is relative to this pane's folder.
@@ -514,7 +517,7 @@ export const PaneChat = memo(function PaneChat({
 
   const send = async () => {
     if (!text || uploading) return;
-    const out = promptForPane(prompt, images);
+    const out = promptForPane(prompt, images, claude);
     if (!(await command(out.text, out.files))) return;
     setFollow((n) => n + 1);
     setPrompt("");