Add the harness, envs, per-bot models and chat attachments

- Harness: providers, model catalog synced hourly, automatic free picks,
  cooldowns, tool loop with context trimming, MCP computer tools
- Bots queue runs replies and tasks through the harness; jobs wait
  (attempt refunded) while every model is resting
- Envs: Settings > Environment, scoped general/workspace/computer,
  written to computers and redacted from tool output
- Models: Settings > Models, per-harness provider select defaulting to
  OpenRouter, and a models modal on each bot's chat (the coordinator's
  edits the defaults)
- Chat: thinking row while a reply runs, file attachments (upload,
  paste, drop) that replies read as images, audio and document text
- Fix media uploads failing after a user's first file, and private
  files being served from the public media path

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/hooks/use-server-event.ts

@@ -0,0 +1,29 @@
+import { useEffect, useRef } from "react";
+import type { WebSocketDataType } from "@/src/types";
+
+type Params = {
+    event: WebSocketDataType["event"];
+    onData: (data: any) => void;
+};
+
+/**
+ * Calls `onData` with the payload of every `event` pushed over the
+ * WebSocket. The socket itself is opened once, by the bots layout (twui
+ * `useWebSocket`, which re-dispatches each message as `wsDataEvent`).
+ */
+export default function useServerEvent({ event, onData }: Params) {
+    const handler = useRef(onData);
+    handler.current = onData;
+
+    useEffect(() => {
+        const listener = (e: Event) => {
+            const data = (e as CustomEvent<{ data?: WebSocketDataType }>).detail?.data;
+
+            if (data?.event == event) handler.current(data.data);
+        };
+
+        window.addEventListener("wsDataEvent", listener);
+
+        return () => window.removeEventListener("wsDataEvent", listener);
+    }, [event]);
+}