refactor(feedback): Focus 토스트를 상단 중앙 단일 채널로 통합

맥락:
- Focus 화면에서 토스트 위치가 Notes 저장/Goal 완료 상황마다 달라져 가독성과 일관성이 떨어졌습니다.

변경사항:
- HUD 내부 status line 렌더를 제거하고 상단 중앙 고정 토스트 컴포넌트를 추가했습니다.
- /space 루트에서 activeStatus를 상단 중앙 토스트로만 표시하도록 피드백 채널을 단일화했습니다.
- Undo 액션은 상단 중앙 토스트 내부 링크로 동일하게 노출되도록 유지했습니다.

검증:
- npx tsc --noEmit

세션-상태: Focus 피드백 채널이 상단 중앙 1곳으로 통일됨
세션-다음: work.md 작업 1부터 Pro/플랜 잠금 정책 재구성 진행
세션-리스크: 기존 lint 규칙의 set-state-in-effect 오류는 별도 축으로 남아 있음

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

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
-import type { HudStatusLineItem, HudStatusLinePayload } from '@/shared/lib/useHudStatusLine';
+import type { HudStatusLinePayload } from '@/shared/lib/useHudStatusLine';
 import { useReducedMotion } from '@/shared/lib/useReducedMotion';
 import { SpaceTimerHudWidget } from '@/widgets/space-timer-hud';
 import { GoalCompleteSheet } from './GoalCompleteSheet';
@@ -10,8 +10,6 @@ interface SpaceFocusHudWidgetProps {
   timerLabel: string;
   visible: boolean;
   onGoalUpdate: (nextGoal: string) => void;
-  statusLine: HudStatusLineItem | null;
-  onStatusAction: () => void;
   onStatusMessage: (payload: HudStatusLinePayload) => void;
 }
 
@@ -20,8 +18,6 @@ export const SpaceFocusHudWidget = ({
   timerLabel,
   visible,
   onGoalUpdate,
-  statusLine,
-  onStatusAction,
   onStatusMessage,
 }: SpaceFocusHudWidgetProps) => {
   const reducedMotion = useReducedMotion();
@@ -100,18 +96,9 @@ export const SpaceFocusHudWidget = ({
       <SpaceTimerHudWidget
         timerLabel={timerLabel}
         goal={goal}
-        statusLine={
-          statusLine
-            ? {
-                message: statusLine.message,
-                actionLabel: statusLine.action?.label,
-              }
-            : null
-        }
         isImmersionMode
         className="pr-[4.2rem]"
         onGoalCompleteRequest={handleOpenCompleteSheet}
-        onStatusAction={onStatusAction}
         onPlaybackStateChange={(state) => {
           if (reducedMotion) {
             playbackStateRef.current = state;

src/widgets/space-timer-hud/ui/SpaceTimerHudWidget.tsx

@@ -12,13 +12,8 @@ interface SpaceTimerHudWidgetProps {
   goal: string;
   className?: string;
   isImmersionMode?: boolean;
-  statusLine?: {
-    message: string;
-    actionLabel?: string;
-  } | null;
   onPlaybackStateChange?: (state: 'running' | 'paused') => void;
   onGoalCompleteRequest?: () => void;
-  onStatusAction?: () => void;
 }
 
 const HUD_ACTIONS = [
@@ -32,10 +27,8 @@ export const SpaceTimerHudWidget = ({
   goal,
   className,
   isImmersionMode = false,
-  statusLine = null,
   onPlaybackStateChange,
   onGoalCompleteRequest,
-  onStatusAction,
 }: SpaceTimerHudWidgetProps) => {
   const { isBreatheMode, triggerRestart } = useRestart30s();
   const normalizedGoal = goal.trim().length > 0 ? goal.trim() : '이번 한 조각을 설정해 주세요.';
@@ -132,30 +125,6 @@ export const SpaceTimerHudWidget = ({
             />
           </div>
         </section>
-        <div
-          className="pointer-events-none absolute bottom-2 left-3.5 z-[12] max-w-[72%]"
-          role="status"
-          aria-live="polite"
-          aria-atomic="true"
-        >
-          <div
-            className={cn(
-              'inline-flex max-w-full items-center gap-1.5 rounded-full border border-white/12 bg-black/24 px-2.5 py-1 text-[10px] text-white/72 backdrop-blur-sm transition-all duration-[220ms] ease-out motion-reduce:duration-0',
-              statusLine ? 'translate-y-0 opacity-100' : 'translate-y-1 opacity-0',
-            )}
-          >
-            <span className="truncate">{statusLine?.message ?? ''}</span>
-            {statusLine?.actionLabel ? (
-              <button
-                type="button"
-                onClick={onStatusAction}
-                className="pointer-events-auto shrink-0 text-[10px] font-medium text-white/84 underline-offset-2 transition-colors hover:text-white hover:underline"
-              >
-                {statusLine.actionLabel}
-              </button>
-            ) : null}
-          </div>
-        </div>
       </div>
     </div>
   );

src/widgets/space-workspace/ui/FocusTopToast.tsx

@@ -0,0 +1,44 @@
+import { cn } from '@/shared/lib/cn';
+
+interface FocusTopToastProps {
+  visible: boolean;
+  message: string;
+  actionLabel?: string;
+  onAction?: () => void;
+}
+
+export const FocusTopToast = ({
+  visible,
+  message,
+  actionLabel,
+  onAction,
+}: FocusTopToastProps) => {
+  return (
+    <div
+      className={cn(
+        'pointer-events-none fixed inset-x-0 z-50 flex justify-center px-3 transition-all duration-[220ms] ease-out motion-reduce:duration-0',
+        'top-[calc(env(safe-area-inset-top,0px)+0.75rem)]',
+        visible ? 'translate-y-0 opacity-100' : '-translate-y-1 opacity-0',
+      )}
+      aria-hidden={!visible}
+    >
+      <div
+        role="status"
+        aria-live="polite"
+        aria-atomic="true"
+        className="pointer-events-auto inline-flex max-w-[min(420px,92vw)] items-center gap-2 rounded-full border border-white/14 bg-black/32 px-3 py-1.5 text-xs text-white/86 shadow-[0_8px_24px_rgba(2,6,23,0.28)] backdrop-blur-md"
+      >
+        <span className="truncate">{message}</span>
+        {actionLabel ? (
+          <button
+            type="button"
+            onClick={onAction}
+            className="shrink-0 text-xs font-medium text-white/92 underline underline-offset-2 transition-colors hover:text-white"
+          >
+            {actionLabel}
+          </button>
+        ) : null}
+      </div>
+    </div>
+  );
+};

src/widgets/space-workspace/ui/SpaceWorkspaceWidget.tsx

@@ -20,6 +20,7 @@ import { useHudStatusLine } from '@/shared/lib/useHudStatusLine';
 import { SpaceFocusHudWidget } from '@/widgets/space-focus-hud';
 import { SpaceSetupDrawerWidget } from '@/widgets/space-setup-drawer';
 import { SpaceToolsDockWidget } from '@/widgets/space-tools-dock';
+import { FocusTopToast } from './FocusTopToast';
 
 type WorkspaceMode = 'setup' | 'focus';
 type SelectionOverride = {
@@ -378,8 +379,6 @@ export const SpaceWorkspaceWidget = () => {
         goal={goalInput.trim()}
         timerLabel={selectedTimerLabel}
         visible={isFocusMode}
-        statusLine={activeStatus}
-        onStatusAction={runActiveAction}
         onStatusMessage={pushStatusLine}
         onGoalUpdate={(nextGoal) => {
           setGoalInput(nextGoal);
@@ -387,6 +386,13 @@ export const SpaceWorkspaceWidget = () => {
         }}
       />
 
+      <FocusTopToast
+        visible={isFocusMode && Boolean(activeStatus)}
+        message={activeStatus?.message ?? ''}
+        actionLabel={activeStatus?.action?.label}
+        onAction={runActiveAction}
+      />
+
       <SpaceToolsDockWidget
         isFocusMode={isFocusMode}
         rooms={setupRooms}