refactor(quick-controls): 사운드 역할 분리와 패널 레이아웃·오버레이 개선

src/widgets/space-tools-dock/model/getQuickSoundPresets.ts

@@ -0,0 +1,21 @@
+import { PRO_LOCKED_SOUND_IDS } from '@/entities/plan';
+import type { SoundPreset } from '@/entities/session';
+
+const QUICK_SOUND_FALLBACK_IDS = ['rain-focus', 'deep-white', 'silent'] as const;
+
+const isQuickAvailablePreset = (preset: SoundPreset | undefined): preset is SoundPreset => {
+  if (!preset) {
+    return false;
+  }
+
+  return !PRO_LOCKED_SOUND_IDS.includes(preset.id);
+};
+
+export const getQuickSoundPresets = (presets: SoundPreset[], selectedPresetId: string) => {
+  const uniquePresetIds = Array.from(new Set([selectedPresetId, ...QUICK_SOUND_FALLBACK_IDS]));
+
+  return uniquePresetIds
+    .map((presetId) => presets.find((preset) => preset.id === presetId))
+    .filter(isQuickAvailablePreset)
+    .slice(0, 3);
+};