FEAT-5: Probeverpaarung page — free genotype entry, client-side breed(), Farbschlag cards + warnings

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

gerbil-manager-web/src/format/genotypeText.ts

@@ -0,0 +1,22 @@
+/** Helpers for free-text genotype input (parse/validate/preview via GEN-1). */
+import { fromDisplayString, genotypeToFarbschlag } from '../genetics'
+
+export function isValidGenotype(genotype: string): boolean {
+  if (!genotype.trim()) return false
+  try {
+    fromDisplayString(genotype)
+    return true
+  } catch {
+    return false
+  }
+}
+
+/** Resolved Farbschlag for a genotype string, or null if empty/invalid. */
+export function previewFarbschlag(genotype: string): string | null {
+  if (!genotype.trim()) return null
+  try {
+    return genotypeToFarbschlag(fromDisplayString(genotype))
+  } catch {
+    return null
+  }
+}