feat: user application dashboard (#727)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/lib/utils/zod-util.ts

@@ -0,0 +1,11 @@
+import z from 'zod/v4';
+
+export const optionalString = z
+	.string()
+	.transform((v) => (v === '' ? undefined : v))
+	.optional();
+
+export const optionalUrl = z
+	.url()
+	.optional()
+	.or(z.literal('').transform(() => undefined));