feat: persist settings and enrich conversation context

docs/data-flow.md

@@ -791,21 +791,14 @@ The historical diagram below is retained for migration context only.
            └─► Continue to next subreddit
 ```
 
-### Browser Session Recovery
+### Account Session Recovery
 
 ```
-1. BrowserClient.verifySession() returns false
+1. Reddit or Matrix authentication is rejected
    │
-   ├─► Check for expired cookies
-   │
-   ├─► Attempt automated re-login
-   │   ├─► BrowserClient.login()
-   │   └─► If success: continue
-   │
-   └─► If re-login fails:
-       ├─► Log error: "Browser session expired"
-       ├─► Stop bot
-       └─► Require manual login (scripts/login.ts)
+   ├─► Invalidate the shared account-auth gate
+   ├─► Stop account-bound schedulers
+   └─► Wait for a fresh combined dump from the Chrome extension
 ```
 
 ---