feat: implement role-based access control

Introduce 'gm', 'player', and 'observer' roles to the journal system.
This includes:
- Restricting command usage and completions to the GM role.
- Implementing role-based message emission permissions.
- Adding a player list and role indicators in the UI.
- Persisting the user's role in localStorage.
- Updating the connection logic to include the role in the client ID.

src/components/journal/StreamMessage.tsx

@@ -5,11 +5,7 @@
 import { Component, Show, createMemo } from "solid-js";
 import type { StreamMessage as StreamMessageType } from "./registry";
 import { getMessageType } from "./registry";
-import {
-  revertLatest,
-  canRevert,
-  useJournalStream,
-} from "../stores/journalStream";
+import { revertLatest, useJournalStream } from "../stores/journalStream";
 
 export const StreamMessageCard: Component<{
   message: StreamMessageType;