feat: add dashboard section visibility settings

lib/dashboard-sections.ts

@@ -0,0 +1,38 @@
+import type { TranslationKey } from "@/lib/i18n";
+
+export const DASHBOARD_SECTION_SETTINGS = [
+  {
+    id: "weatherBrief",
+    titleKey: "settings.dashboardSections.weatherBrief.title",
+    descriptionKey: "settings.dashboardSections.weatherBrief.description",
+    defaultVisible: true,
+  },
+  {
+    id: "featuredStations",
+    titleKey: "settings.dashboardSections.featuredStations.title",
+    descriptionKey: "settings.dashboardSections.featuredStations.description",
+    defaultVisible: false,
+  },
+] as const satisfies ReadonlyArray<{
+  id: string;
+  titleKey: TranslationKey;
+  descriptionKey: TranslationKey;
+  defaultVisible: boolean;
+}>;
+
+export type DashboardSectionId = typeof DASHBOARD_SECTION_SETTINGS[number]["id"];
+
+export type DashboardSectionVisibility = Record<DashboardSectionId, boolean>;
+
+export const DEFAULT_DASHBOARD_SECTION_VISIBILITY = DASHBOARD_SECTION_SETTINGS.reduce((visibility, section) => ({
+  ...visibility,
+  [section.id]: section.defaultVisible,
+}), {} as DashboardSectionVisibility);
+
+export function normalizeDashboardSectionVisibility(value: unknown): DashboardSectionVisibility {
+  const stored = value && typeof value === "object" ? value as Partial<Record<DashboardSectionId, unknown>> : {};
+  return DASHBOARD_SECTION_SETTINGS.reduce((visibility, section) => ({
+    ...visibility,
+    [section.id]: typeof stored[section.id] === "boolean" ? stored[section.id] : section.defaultVisible,
+  }), {} as DashboardSectionVisibility);
+}