Add autoTranslateCachedOnly option to auto-translate only previously translated text when enabled.

src/ts/storage/database.svelte.ts

@@ -846,6 +846,7 @@ export interface Database{
         otherAx: SeparateParameters
     }
     translateBeforeHTMLFormatting:boolean
+    autoTranslateCachedOnly:boolean
 }
 
 interface SeparateParameters{

src/ts/translator/translator.ts

@@ -507,4 +507,8 @@ async function translateLLM(text:string, arg:{to:string, regenerate?:boolean}):P
     }).replace(/<\/style-data>/g, '')
     await LLMCacheStorage.setItem(text, result)
     return result
+}
+
+export async function getLLMCache(text:string):Promise<string | null>{
+    return await LLMCacheStorage.getItem(text)
 }