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.ts

@@ -6,13 +6,25 @@
 export const ComputerRefHrefPrefix = "#computer-";
 
 /**
- * Turns every computer ref in a message into a markdown link to
- * `#computer-<id>`, so it survives markdown rendering as a link the chat
- * can swap for a switch button.
+ * The link target a take-over ref (`takeOverRef`) becomes, e.g.
+ * `#take-over-3-browser`. The chat renders these as buttons that open the
+ * computer in that mode.
+ */
+export const TakeOverRefHrefPrefix = "#take-over-";
+
+/**
+ * Turns every computer ref (`[computer:3]`) and take-over ref
+ * (`[take-over:3:browser]`) in a message into a markdown link, so it
+ * survives markdown rendering as a link the chat can swap for a button.
  */
 export default function linkComputerRefs({ text }: { text: string }) {
-    return text.replace(
-        /\[computer:(\d+)\](?!\()/g,
-        (_, id: string) => `[computer ${id}](${ComputerRefHrefPrefix}${id})`,
-    );
+    return text
+        .replace(
+            /\[computer:(\d+)\](?!\()/g,
+            (_, id: string) => `[computer ${id}](${ComputerRefHrefPrefix}${id})`,
+        )
+        .replace(
+            /\[take-over:(\d+):([a-z]+)\](?!\()/g,
+            (_, id: string, mode: string) => `[take over](${TakeOverRefHrefPrefix}${id}-${mode})`,
+        );
 }