feat: add app section visibility settings

lib/app-sections.ts

@@ -0,0 +1,46 @@
+import type { TranslationKey } from "@/lib/i18n";
+
+export const APP_SECTION_SETTINGS = [
+  {
+    id: "warnings",
+    href: "/warnings",
+    titleKey: "settings.appSections.warnings.title",
+    descriptionKey: "settings.appSections.warnings.description",
+    defaultVisible: true,
+  },
+  {
+    id: "hydro",
+    href: "/hydro",
+    titleKey: "settings.appSections.hydro.title",
+    descriptionKey: "settings.appSections.hydro.description",
+    defaultVisible: false,
+  },
+] as const satisfies ReadonlyArray<{
+  id: string;
+  href: string;
+  titleKey: TranslationKey;
+  descriptionKey: TranslationKey;
+  defaultVisible: boolean;
+}>;
+
+export type AppSectionId = typeof APP_SECTION_SETTINGS[number]["id"];
+
+export type AppSectionVisibility = Record<AppSectionId, boolean>;
+
+export const DEFAULT_APP_SECTION_VISIBILITY = APP_SECTION_SETTINGS.reduce((visibility, section) => ({
+  ...visibility,
+  [section.id]: section.defaultVisible,
+}), {} as AppSectionVisibility);
+
+export function normalizeAppSectionVisibility(value: unknown): AppSectionVisibility {
+  const stored = value && typeof value === "object" ? value as Partial<Record<AppSectionId, unknown>> : {};
+  return APP_SECTION_SETTINGS.reduce((visibility, section) => ({
+    ...visibility,
+    [section.id]: typeof stored[section.id] === "boolean" ? stored[section.id] : section.defaultVisible,
+  }), {} as AppSectionVisibility);
+}
+
+export function isAppNavItemVisible(href: string, visibility: AppSectionVisibility) {
+  const section = APP_SECTION_SETTINGS.find((candidate) => candidate.href === href);
+  return section ? visibility[section.id] : true;
+}