refactor(i18n): 사용자 문구 참조를 중앙화

src/widgets/space-focus-hud/ui/SpaceFocusHudWidget.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useRef, useState } from 'react';
+import { copy } from '@/shared/i18n';
 import type { HudStatusLinePayload } from '@/shared/lib/useHudStatusLine';
 import { SpaceTimerHudWidget } from '@/widgets/space-timer-hud';
 import { GoalCompleteSheet } from './GoalCompleteSheet';
@@ -44,7 +45,7 @@ export const SpaceFocusHudWidget = ({
   const visibleRef = useRef(false);
   const playbackStateRef = useRef<'running' | 'paused'>(playbackState);
   const restReminderTimerRef = useRef<number | null>(null);
-  const normalizedGoal = goal.trim().length > 0 ? goal.trim() : '집중을 시작해요.';
+  const normalizedGoal = goal.trim().length > 0 ? goal.trim() : copy.space.focusHud.goalFallback;
 
   useEffect(() => {
     return () => {
@@ -58,7 +59,7 @@ export const SpaceFocusHudWidget = ({
   useEffect(() => {
     if (visible && !visibleRef.current && playbackState === 'running') {
       onStatusMessage({
-        message: `이번 한 조각 · ${normalizedGoal}`,
+        message: copy.space.focusHud.goalToast(normalizedGoal),
       });
     }
 
@@ -68,7 +69,7 @@ export const SpaceFocusHudWidget = ({
   useEffect(() => {
     if (playbackStateRef.current === 'paused' && playbackState === 'running' && visible) {
       onStatusMessage({
-        message: `이번 한 조각 · ${normalizedGoal}`,
+        message: copy.space.focusHud.goalToast(normalizedGoal),
       });
     }
 
@@ -115,7 +116,7 @@ export const SpaceFocusHudWidget = ({
           }
 
           restReminderTimerRef.current = window.setTimeout(() => {
-            onStatusMessage({ message: '5분이 지났어요. 다음 한 조각으로 돌아와요.' });
+            onStatusMessage({ message: copy.space.focusHud.restReminder });
             restReminderTimerRef.current = null;
           }, 5 * 60 * 1000);
         }}