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/link-computer-refs.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, test } from "bun:test";
 import computerRef from "./computer-ref";
 import linkComputerRefs from "./link-computer-refs";
+import takeOverRef from "./take-over-ref";
 
 describe("linkComputerRefs", () => {
     test("links every computer a message names", () => {
@@ -16,4 +17,12 @@ describe("linkComputerRefs", () => {
 
         expect(linkComputerRefs({ text })).toBe(text);
     });
+
+    test("links take-over requests", () => {
+        expect(
+            linkComputerRefs({
+                text: `Please log in to Gmail. ${takeOverRef({ id: 3, mode: "browser" })}`,
+            }),
+        ).toBe("Please log in to Gmail. [take over](#take-over-3-browser)");
+    });
 });