fix: No longer displays edited on all messages and fix Disconnected from signaling server on multiple clients

agents-docs/LESSONS.md

@@ -25,6 +25,13 @@ Durable rules for AI agents working on this project. Read this file at session s
 
 ## Lessons
 
+### Store clientInstanceId in sessionStorage not localStorage [realtime] [multi-device]
+
+- **Trigger:** same user logged in on two tabs, browsers, or synced profiles sees alternating "Disconnected from signaling server" and no cross-device chat/voice sync.
+- **Rule:** persist `metoyou.clientInstanceId` in `sessionStorage` (one id per tab/window) and clear any legacy `localStorage` copy on first read.
+- **Why:** server identify evicts stale sockets with the same `(oderId, connectionScope, clientInstanceId)` tuple; a shared localStorage id makes each client kick the other in a reconnect loop.
+- **Example:** `ClientInstanceService.getClientInstanceId()` writes to `sessionStorage`; two tabs get different ids and stay connected simultaneously.
+
 ### Revalidate IndexedDB scope without reinitializing on every read [persistence] [performance]
 
 - **Trigger:** `DatabaseService.ensureReady()` called `initialize()` before every delegated read/write to fix user-scope races.