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/parse-computer-proxy-path.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, test } from "bun:test";
+import parseComputerProxyPath from "./parse-computer-proxy-path";
+
+describe("parseComputerProxyPath", () => {
+    test("splits the computer id from the path on it", () => {
+        expect(parseComputerProxyPath({ pathname: "/computers/3/v1/shell/ws" })).toEqual({
+            computer_id: 3,
+            prefix: "/computers/3",
+            rest: "v1/shell/ws",
+        });
+    });
+
+    test("takes the computer's root with or without a slash", () => {
+        expect(parseComputerProxyPath({ pathname: "/computers/3" })?.rest).toBe("");
+        expect(parseComputerProxyPath({ pathname: "/computers/3/" })?.rest).toBe("");
+    });
+
+    test("ignores anything else", () => {
+        expect(parseComputerProxyPath({ pathname: "/computers" })).toBeNull();
+        expect(parseComputerProxyPath({ pathname: "/computers/x/terminal" })).toBeNull();
+        expect(parseComputerProxyPath({ pathname: "/computers/0/terminal" })).toBeNull();
+        expect(parseComputerProxyPath({ pathname: "/computersx/3" })).toBeNull();
+    });
+});