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/utils/computer-view-url.ts

@@ -0,0 +1,20 @@
+import {
+    ComputerProxyPrefix,
+    ComputerViewModes,
+    type ComputerViewMode,
+} from "@/src/dict/computer-dict";
+
+type Params = {
+    computer_id: number | string;
+    mode: ComputerViewMode;
+};
+
+/**
+ * The app address of one of a computer's modes, e.g.
+ * `/computers/3/terminal`.
+ */
+export default function computerViewUrl({ computer_id, mode }: Params) {
+    const path = ComputerViewModes.find((m) => m.value == mode)?.path || "";
+
+    return `${ComputerProxyPrefix}/${computer_id}/${path}`;
+}