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-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}