change ko_text: to tts:

docs/.vitepress/theme/components/SentenceAudio.vue

@@ -2,7 +2,7 @@
   <component
     :is="lang !== 'ko' || v.audio ? 'span' : TTS"
     ref="stts"
-    :text="v.ko_text"
+    :text="v.tts"
   >
     <span
       v-for="(seg, i) in v[lang].split('**')"

docs/.vitepress/theme/types.ts

@@ -3,7 +3,7 @@ import * as z from "zod";
 // 1. Define the interface manually (do not use z.infer here)
 export interface IVoc {
   ko: string;
-  ko_text?: string;
+  tts?: string;
   audio?: string;
   en: string;
   usage?: IVoc[];
@@ -15,7 +15,7 @@ export interface IVoc {
 export const Voc: z.ZodType<IVoc> = z.lazy(() =>
   z.object({
     ko: z.string(),
-    ko_text: z.string().optional(),
+    tts: z.string().optional(),
     audio: z.string().optional(),
     en: z.string(),
     usage: z.array(Voc).optional(),

docs/howtostudykorean/theme/01-school.md

@@ -824,7 +824,7 @@ sentence:
 
     - ko: 저는 1-2이에요
       notes: ("일학년-이반")
-      ko_text: 저는 일학년-이반이에요
+      tts: 저는 일학년-이반이에요
       en: I am in class 1-2
 
     - ko: 저는 3학년이에요

docs/howtostudykorean/theme/02-transportation.md

@@ -630,7 +630,7 @@ sentence:
       en: Please, sit down (often said to an older person when giving up your seat)
 
     - ko: 저는 금방 내려요 (내릴 거에요)
-      ko_text: 저는 금방 내려요
+      tts: 저는 금방 내려요
       en: I’m getting off soon
 
     - ko: 교통카드를 어디서 살 수 있어요?

docs/howtostudykorean/theme/03-eating.md

@@ -483,7 +483,7 @@ vocabulary:
 
   meals:
     - ko: 아침(식사)
-      ko_text: 아침
+      tts: 아침
       en: breakfast
       notes: |
         아침 also means "morning" (hence 아침식사 literally means "morning meal"), but context always makes clear whether the speaker means "morning" or "breakfast." For example:
@@ -502,7 +502,7 @@ vocabulary:
           en: I ate **breakfast**
 
     - ko: 점심(식사)
-      ko_text: 점심
+      tts: 점심
       en: lunch
       notes: |
         Like 아침, 점심 can stand alone (without 식사 attached) to mean "lunch," and context makes it clear whether "lunch" is meant. Unlike 아침, 점심 does not separately mean "midday" the way 아침 means "morning" — in everyday use, 점심 simply refers to the meal.
@@ -519,7 +519,7 @@ vocabulary:
           en: Who paid for **lunch**?
 
     - ko: 저녁(식사)
-      ko_text: 저녁
+      tts: 저녁
       en: dinner
       notes: |
         Like 아침, 저녁 can be used alone (without 식사 attached) to mean "dinner." 저녁 also means "evening," and just as with 아침, context makes it clear whether the speaker means "evening" or "dinner." For example: