fix: Chat trigger on start (#788)

# PR Checklist
- [ ] Have you checked if it works normally in all models? *Ignore this
if it doesn't use models.*
- [ ] Have you checked if it works normally in all web, local, and node
hosted versions? If it doesn't, have you blocked it in those versions?
- [ ] Have you added type definitions?

# Description
This PR aims to fix the following issues:
1. Fixed an issue where chat array changes caused by the 'start' mode
trigger were not being applied correctly. (This problem occurs in both
block type and Lua type.)
2. Occasionally, there was a problem with scriptstate desync in Lua
triggers, so I've changed to update method on every call.

src/ts/process/index.svelte.ts

@@ -1,5 +1,5 @@
 import { get, writable } from "svelte/store";
-import { type character, type MessageGenerationInfo, type Chat, changeToPreset } from "../storage/database.svelte";
+import { type character, type MessageGenerationInfo, type Chat, changeToPreset, setCurrentChat } from "../storage/database.svelte";
 import { DBState } from '../stores.svelte';
 import { CharEmotion, selectedCharID } from "../stores.svelte";
 import { ChatTokenizer, tokenize, tokenizeNum } from "../tokenizer";
@@ -696,6 +696,7 @@ export async function sendChat(chatProcessIndex = -1,arg:{
     const triggerResult = await runTrigger(currentChar, 'start', {chat: currentChat})
     if(triggerResult){
         currentChat = triggerResult.chat
+        setCurrentChat(currentChat)
         ms = currentChat.message
         currentTokens += triggerResult.tokens
         if(triggerResult.stopSending){

src/ts/process/lua.ts

@@ -23,6 +23,8 @@ interface LuaEngineState {
     engine: LuaEngine;
     mutex: Mutex;
     chat: Chat;
+    setVar: (key:string, value:string) => void,
+    getVar: (key:string) => string
 }
 
 let LuaEngines = new Map<string, LuaEngineState>()
@@ -55,12 +57,16 @@ export async function runLua(code:string, arg:{
             code,
             engine: await luaFactory.createEngine({injectObjects: true}),
             mutex: new Mutex(),
-            chat
+            chat,
+            setVar,
+            getVar
         }
         LuaEngines.set(mode, luaEngineState)
         wasEmpty = true
     } else {
         luaEngineState.chat = chat
+        luaEngineState.setVar = setVar
+        luaEngineState.getVar = getVar
     }
     return await luaEngineState.mutex.runExclusive(async () => {
         if (wasEmpty || code !== luaEngineState.code) {
@@ -72,13 +78,13 @@ export async function runLua(code:string, arg:{
                 if(!LuaSafeIds.has(id) && !LuaEditDisplayIds.has(id)){
                     return
                 }
-                setVar(key, value)
+                luaEngineState.setVar(key, value)
             })
             luaEngine.global.set('getChatVar', (id:string,key:string) => {
                 if(!LuaSafeIds.has(id) && !LuaEditDisplayIds.has(id)){
                     return
                 }
-                return getVar(key)
+                return luaEngineState.getVar(key)
             })
             luaEngine.global.set('stopChat', (id:string) => {
                 if(!LuaSafeIds.has(id)){