chore: seminarhof customer project

apps/app/src/direction.ts

@@ -0,0 +1,40 @@
+/**
+ * Document direction (LTR / RTL).
+ *
+ * v1 is EN-only but every widget and page must render correctly under
+ * RTL — the plumbing is always active. Precedence:
+ *
+ *   1. `?dir=rtl` query param (dev override — test any route in RTL)
+ *   2. localStorage `fabric-dir` (user preference across reloads)
+ *   3. `document.documentElement.dir`
+ *   4. 'ltr' fallback
+ *
+ * Locale-bound direction (Arabic / Hebrew / Persian → RTL) is post-v1.
+ * Shape supports it — call `setDirection('rtl')` when a locale loads.
+ */
+
+export type Direction = 'ltr' | 'rtl'
+
+const STORAGE_KEY = 'fabric-dir'
+
+export function readInitialDirection(): Direction {
+  if (typeof window === 'undefined') return 'ltr'
+
+  const query = new URLSearchParams(window.location.search).get('dir')
+  if (query === 'rtl' || query === 'ltr') return query
+
+  const stored = window.localStorage.getItem(STORAGE_KEY)
+  if (stored === 'rtl' || stored === 'ltr') return stored
+
+  const docDir = window.document.documentElement.dir
+  if (docDir === 'rtl' || docDir === 'ltr') return docDir
+
+  return 'ltr'
+}
+
+export function applyDirection(dir: Direction) {
+  if (typeof window !== 'undefined') {
+    window.localStorage.setItem(STORAGE_KEY, dir)
+    window.document.documentElement.dir = dir
+  }
+}