설정 db 저장

frontend/src/utils/chartMagnetModeStorage.ts

@@ -0,0 +1,16 @@
+import { getUiPreferences, patchUiPreferences } from './uiPreferencesDb';
+
+export type MagnetMode = 'off' | 'weak' | 'strong';
+
+function normalizeMagnetMode(v: unknown): MagnetMode {
+  return v === 'weak' || v === 'strong' ? v : 'off';
+}
+
+/** DB ui_preferences.chart.magnetMode */
+export function loadMagnetMode(): MagnetMode {
+  return normalizeMagnetMode(getUiPreferences().chart?.magnetMode);
+}
+
+export function saveMagnetMode(mode: MagnetMode): void {
+  patchUiPreferences({ chart: { magnetMode: mode } });
+}

frontend/src/utils/localThemeStorage.ts

@@ -8,7 +8,7 @@ function isTheme(v: unknown): v is Theme {
   return typeof v === 'string' && (VALID as readonly string[]).includes(v);
 }
 
-/** 이 브라우저(기기)에 저장된 UI 테마. 계정·DB와 무관 */
+/** 이 브라우저(기기)에 저장된 UI 테마 — 게스트·오프라인 폴백 */
 export function loadLocalTheme(): Theme {
   try {
     const raw = localStorage.getItem(STORAGE_KEY);
@@ -27,7 +27,13 @@ export function saveLocalTheme(theme: Theme): void {
   }
 }
 
-/** localStorage에 없을 때만 DB defaultTheme을 이 기기에 1회 복사 */
+/** 로그인 사용자: DB defaultTheme 우선. 게스트: localStorage */
+export function resolveThemeForSession(dbTheme: string | undefined, useAccountScope: boolean): Theme {
+  if (useAccountScope && isTheme(dbTheme)) return dbTheme;
+  return loadLocalTheme();
+}
+
+/** localStorage에 없을 때만 DB defaultTheme을 이 기기에 1회 복사 (게스트) */
 export function migrateDbThemeToLocalIfNeeded(dbTheme: string | undefined): Theme {
   try {
     const existing = localStorage.getItem(STORAGE_KEY);
@@ -39,3 +45,5 @@ export function migrateDbThemeToLocalIfNeeded(dbTheme: string | undefined): Them
   saveLocalTheme(theme);
   return theme;
 }
+
+export { isTheme };