Type Safety (Issue front end lmao) (ChatGPTNextWeb#203)

* Chore [Chat] [Client Api] Type Safety

- [+] chore(chat.ts): change 'var' to 'let' for 'api' variable assignment
- [+] refactor(chat.ts): improve comment explaining the reason for using 'let' instead of 'var'

* Fix [Chat] [Client Api] change 'var' to 'let' for variable 'api'

- [+] fix(chat.ts): change 'var' to 'let' for variable 'api' to allow conditional reassignment
- [+] fix(chat.ts): update session messages with new bot and user messages

* Chore [Chat] Update Session Messages

- [+] chore(chat.ts): update session messages with new bot message in useChatStore

* Fix [Chat] Concat

- [+] fix(chat.ts): remove unnecessary code for updating session messages
- [+] feat(chat.ts): add support for updating session messages

app/store/chat.ts

@@ -303,7 +303,9 @@ export const useChatStore = createPersistStore(
           ]);
         });
 
-        var api: ClientApi;
+        // Changed 'var' to 'let' since 'api' is reassigned conditionally
+       // Note: keep type safety by using 'let' instead of 'var', this not a javascript lmao
+        let api: ClientApi;
         if (modelConfig.model === "gemini-pro") {
           api = new ClientApi(ModelProvider.GeminiPro);
         } else {
@@ -491,7 +493,9 @@ export const useChatStore = createPersistStore(
         const session = get().currentSession();
         const modelConfig = session.mask.modelConfig;
 
-        var api: ClientApi;
+        // Changed 'var' to 'let' since 'api' is reassigned conditionally
+        // Note: keep type safety by using 'let' instead of 'var', this not a javascript lmao
+        let api: ClientApi;
         if (modelConfig.model === "gemini-pro") {
           api = new ClientApi(ModelProvider.GeminiPro);
         } else {