fix: auth race condition on refresh, section edit dialog, time slot duplicate, autocomplete disable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/app/src/lib/dutch-plural.ts

@@ -0,0 +1,15 @@
+/**
+ * Basic Dutch pluralisation for configurable event labels.
+ * Covers the known sub_event_label values: Dag, Programmaonderdeel, Editie, Locatie, Ronde.
+ */
+export function dutchPlural(word: string): string {
+  // Words ending in -ie: add -s (editie → edities, locatie → locaties)
+  if (word.endsWith('ie')) return `${word}s`
+  // Words ending in -e: add -s (ronde → rondes)
+  if (word.endsWith('e')) return `${word}s`
+  // Double vowel before final consonant(s): single vowel + en (onderdeel → onderdelen)
+  const match = word.match(/^(.*)([aeiou])\2([^aeiou]+)$/i)
+  if (match) return `${match[1]}${match[2]}${match[3]}en`
+  // Default: add -en (dag → dagen)
+  return `${word}en`
+}