Open computers from the chat, let bots ask for a take-over, show task progress

- Serve each computer to its owner under /computers/<id>/ (HTTP and
  websockets proxied to the AIO sandbox) and show it in a shared
  ComputerView with browser, terminal and code modes, opened from the
  computers modal or a take-over button in the thread.
- ask_user_to_take_over lets a bot hand a computer to the user for a
  login or captcha; the message gets a take-over button and needs-you,
  and the viewer hands it back with a chat message.
- While a task runs the thread shows "<bot> is working..." with the
  task's latest step; steps read as plain words, not tool names.
- A coordinator with no workers no longer claims to delegate, and bots
  describe started tasks in the first person.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/components/general/computer-view-frame.tsx

@@ -0,0 +1,29 @@
+import { ComputerViewModes, type ComputerViewMode } from "@/src/dict/computer-dict";
+import computerViewUrl from "@/src/utils/computer-view-url";
+
+type Props = {
+    computer_id: number;
+    name: string;
+    mode: ComputerViewMode;
+    /**
+     * The mode on show; the others stay loaded but hidden.
+     */
+    active: boolean;
+};
+
+/**
+ * One of a computer's apps in a frame. A raw iframe: twui has no
+ * equivalent.
+ */
+export default function ComputerViewFrame({ computer_id, name, mode, active }: Props) {
+    const title = ComputerViewModes.find((m) => m.value == mode)?.title || mode;
+
+    return (
+        <iframe
+            src={computerViewUrl({ computer_id, mode })}
+            title={`${name}: ${title}`}
+            allow="clipboard-read; clipboard-write; fullscreen"
+            className={`absolute inset-0 w-full h-full border-0 bg-sunken ${active ? "" : "hidden"}`}
+        />
+    );
+}