refactor(chat): modify newSession logic to avoid resetting old sessio… (#185)

src/stores/chat.ts

@@ -1010,19 +1010,10 @@ export const useChatStore = create<ChatState>((set, get) => ({
   // ── New session ──
 
   newSession: () => {
-    const { currentSessionKey } = get();
-
-    // Notify the gateway that the old session is ending so the session-memory
-    // hook can persist conversation memories to memory/YYYY-MM-DD-<slug>.md.
-    if (currentSessionKey) {
-      void window.electron.ipcRenderer.invoke(
-        'gateway:rpc',
-        'sessions.reset',
-        { key: currentSessionKey, reason: 'new' },
-      ).catch(() => { /* fire-and-forget */ });
-    }
-
-    // Generate a new unique session key and switch to it
+    // Generate a new unique session key and switch to it.
+    // NOTE: We intentionally do NOT call sessions.reset on the old session.
+    // sessions.reset archives (renames) the session JSONL file, making old
+    // conversation history inaccessible when the user switches back to it.
     const prefix = getCanonicalPrefixFromSessions(get().sessions) ?? DEFAULT_CANONICAL_PREFIX;
     const newKey = `${prefix}:session-${Date.now()}`;
     const newSessionEntry: ChatSession = { key: newKey, displayName: newKey };