chore: seminarhof customer project

apps/app/src/lib/auth.ts

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+import { createAuthClient } from 'better-auth/client'
+
+function apiUrl(): string {
+  if (typeof window !== 'undefined' && (window as any).__E2E_API_URL) {
+    return (window as any).__E2E_API_URL as string
+  }
+  return import.meta.env.VITE_API_URL ?? '/api'
+}
+
+// Better Auth mounts at /api/auth (default basePath); the client appends the
+// endpoint verbatim to baseURL, so the base must include /auth — otherwise it
+// emits /api/sign-in/email and 404s on both sandbox and deploy.
+export const authClient = createAuthClient({
+  baseURL: `${apiUrl()}/auth`,
+})
+
+export async function signIn(email: string, password: string): Promise<void> {
+  const { error } = await authClient.signIn.email({ email, password })
+  if (error) throw new Error('Invalid credentials')
+}
+
+export async function signOut(): Promise<void> {
+  await authClient.signOut()
+}

apps/app/src/lib/dates.ts

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+// Placeholder shown for missing dates (an enquiry may not have dates yet).
+const NO_DATE = '—'
+
+export function fmtDate(d: Date | null | undefined, locale: string): string {
+  if (!d) return NO_DATE
+  return d.toLocaleDateString(locale.startsWith('de') ? 'de-DE' : 'en-GB', {
+    day: 'numeric',
+    month: 'short',
+    year: 'numeric',
+  })
+}
+
+export function fmtDateShort(d: Date | null | undefined, locale: string): string {
+  if (!d) return NO_DATE
+  return d.toLocaleDateString(locale.startsWith('de') ? 'de-DE' : 'en-GB', {
+    day: 'numeric',
+    month: 'short',
+  })
+}
+
+export function toDateInputStr(d: Date | null | undefined): string {
+  if (!d) return ''
+  return d.toISOString().slice(0, 10)
+}

apps/app/src/lib/status.ts

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+// Brand-aligned status palettes. Single source of truth for booking, invoice
+// and room state colours. Each entry: bg (badge background), fg (text colour)
+// and dot (8 px leading dot). Hex codes are checked for ≥4.5:1 on bg.
+
+export type BookingStatus =
+  | 'enquiry'
+  | 'reserved'
+  | 'confirmed'
+  | 'ended'
+  | 'cancelled'
+
+export const BOOKING_STATUS: Record<BookingStatus, { bg: string; fg: string; dot: string }> = {
+  enquiry:   { bg: '#F7EEF5', fg: '#583651', dot: '#BC7AA6' },
+  reserved:  { bg: '#FFEDDC', fg: '#8A4A1A', dot: '#FFBC7D' },
+  confirmed: { bg: '#E9D4E2', fg: '#4E3149', dot: '#88557F' },
+  ended:     { bg: '#EDEDED', fg: '#4A4A4A', dot: '#989499' },
+  cancelled: { bg: '#F2F2F2', fg: '#6B6B6B', dot: '#B5B5B5' },
+}
+
+/** Valid transitions per status (client-side, for CTA buttons). Enforced server-side too. */
+export const BOOKING_TRANSITIONS: Record<BookingStatus, BookingStatus[]> = {
+  enquiry:   ['reserved', 'cancelled'],
+  reserved:  ['confirmed', 'cancelled'],
+  confirmed: ['ended', 'cancelled'],
+  ended: [],
+  cancelled: [],
+}
+
+export type InvoiceStatus = 'outstanding' | 'paid' | 'cancelled'
+
+export const INVOICE_STATUS: Record<InvoiceStatus, { bg: string; fg: string; dot: string }> = {
+  outstanding: { bg: '#FFF8E0', fg: '#806600', dot: '#FFCE00' },
+  paid:        { bg: '#E9D4E2', fg: '#4E3149', dot: '#88557F' },
+  cancelled:   { bg: '#F2F2F2', fg: '#6B6B6B', dot: '#B5B5B5' },
+}