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/bots-queue/with-take-over-refs.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, test } from "bun:test";
+import takeOverRef from "@/src/utils/take-over-ref";
+import withTakeOverRefs from "./with-take-over-refs";
+
+const ref = takeOverRef({ id: 1, mode: "browser" });
+
+describe("withTakeOverRefs", () => {
+    test("adds a take-over the bot didn't write, once", () => {
+        expect(withTakeOverRefs({ text: "Please log in to Gmail.", refs: [ref, ref] })).toEqual({
+            result: `Please log in to Gmail.\n\n${ref}`,
+            needs_you: true,
+        });
+    });
+
+    test("keeps one the bot wrote itself", () => {
+        const text = `Log in here: ${ref}`;
+
+        expect(withTakeOverRefs({ text, refs: [ref] })).toEqual({ result: text, needs_you: true });
+    });
+
+    test("leaves a message without a take-over alone", () => {
+        expect(withTakeOverRefs({ text: "Done.", refs: [] })).toEqual({ result: "Done.", needs_you: false });
+    });
+});