fix(auth): unify imported sessions with account gating

src/web/context.ts

@@ -18,6 +18,7 @@ import type { ActivityLog } from './activity-log.js';
 import type { LogBroadcaster } from './log-broadcaster.js';
 import type { RuntimeConfig } from './types.js';
 import type { RedditSessionImporter } from '../services/reddit-session-importer.js';
+import type { AccountAuthContext } from '../services/account-auth-context.js';
 
 /** Bag of everything the route modules might need. */
 export interface WebContext {
@@ -43,6 +44,7 @@ export interface WebContext {
     strategySelector?: StrategySelector;
     browser?: BrowserClient;
     sessionImporter?: RedditSessionImporter;
+    accountAuth?: AccountAuthContext;
     conversationState?: ConversationStateRepository;
   };