feat(journal): delete sessions from the ui

Add a confirmation dialog that spells out the removal is irreversible, and expose delete from the GM session dropdown and the lobby session list.

src/components/journal/index.ts

@@ -45,6 +45,7 @@ export { ConnectDialog } from "./ConnectDialog";
 export { InviteDialog } from "./InviteDialog";
 export { SessionDropdown } from "./SessionDropdown";
 export { CreateSessionDialog } from "./CreateSessionDialog";
+export { DeleteSessionDialog } from "./DeleteSessionDialog";
 export { StreamView } from "./StreamView";
 export { StreamMessageCard } from "./StreamMessage";
 export { ComposePanel } from "./ComposePanel";