POLISH-1: gridify emits canonical '='; localize litter InvalidParentGender 400 (ApiError body) + de strings

gerbil-manager-web/src/api/client.ts

@@ -13,15 +13,27 @@ export class ApiError extends Error {
   readonly status: number | null
   /** The request path that failed (for diagnostics/logging). */
   readonly path?: string
+  /** Parsed error response body, if any (e.g. { code, ... } for 400s). */
+  readonly body?: unknown
 
-  constructor(message: string, status: number | null, path?: string) {
+  constructor(message: string, status: number | null, path?: string, body?: unknown) {
     super(message)
     this.name = 'ApiError'
     this.status = status
     this.path = path
+    this.body = body
   }
 }
 
+/** Read a `code` field off a parsed ApiError body, if present. */
+export function errorCode(err: unknown): string | null {
+  if (err instanceof ApiError && err.body && typeof err.body === 'object' && 'code' in err.body) {
+    const code = (err.body as { code: unknown }).code
+    return typeof code === 'string' ? code : null
+  }
+  return null
+}
+
 function errorMessageFor(status: number): string {
   if (status === 404) return de.api.errors.notFound
   if (status >= 500) return de.api.errors.server
@@ -40,7 +52,14 @@ async function request<T>(path: string, init?: RequestInit): Promise<T> {
   }
 
   if (!response.ok) {
-    throw new ApiError(errorMessageFor(response.status), response.status, path)
+    // Best-effort parse of a JSON error body (e.g. { code: "InvalidParentGender" }).
+    let body: unknown
+    try {
+      body = await response.clone().json()
+    } catch {
+      body = undefined
+    }
+    throw new ApiError(errorMessageFor(response.status), response.status, path, body)
   }
 
   if (response.status === 204) {

gerbil-manager-web/src/api/gridify.ts

@@ -47,8 +47,10 @@ export function condition(c: FilterCondition): string {
     const suffix = c.caseInsensitive === false ? '' : '/i'
     return `${c.field}=*${escaped}*${suffix}`
   }
+  // Gridify's equals operator is a single '='; callers use '==' semantically.
+  const op = c.op === '==' ? '=' : c.op
   const suffix = c.caseInsensitive ? '/i' : ''
-  return `${c.field}${c.op}${escaped}${suffix}`
+  return `${c.field}${op}${escaped}${suffix}`
 }
 
 /** Join conditions with AND (comma). Falsy/empty conditions are dropped. */

gerbil-manager-web/src/pages/WurfFormPage.tsx

@@ -1,6 +1,7 @@
 import { useMemo, useState, type FormEvent } from 'react'
 import { Link, useNavigate, useParams } from 'react-router-dom'
 import { de } from '../strings/de'
+import { errorCode } from '../api/client'
 import { createLitter, getLitter, updateLitter } from '../api/litters'
 import { listGerbils } from '../api/gerbils'
 import type { CreateLitter } from '../api/types'
@@ -49,6 +50,7 @@ export default function WurfFormPage() {
 
   const [form, setForm] = useState<FormState>(EMPTY)
   const [errors, setErrors] = useState<Partial<Record<keyof FormState, string>>>({})
+  const [submitError, setSubmitError] = useState<string | null>(null)
   const [goHomeTouched, setGoHomeTouched] = useState(false)
   const [initializedFor, setInitializedFor] = useState<string | null>(null)
 
@@ -116,9 +118,18 @@ export default function WurfFormPage() {
       expectedGoHomeDate: nn(form.expectedGoHomeDate),
       notes: nn(form.notes),
     }
+    setSubmitError(null)
     const result = await mutation.run(body)
-    if (result.ok) navigate(`/wuerfe/${result.value.id}`)
-    // On failure mutation.error drives the inline alert; run() never throws.
+    if (result.ok) {
+      navigate(`/wuerfe/${result.value.id}`)
+      return
+    }
+    // Localize the backend's parent-gender 400 by its code; else generic message.
+    setSubmitError(
+      errorCode(result.cause) === 'InvalidParentGender'
+        ? t.validation.invalidParentGender
+        : result.error,
+    )
   }
 
   if (isEdit && existing.loading) return <p className="muted">{de.common.loading}</p>
@@ -223,7 +234,7 @@ export default function WurfFormPage() {
           <textarea value={form.notes} onChange={(e) => set('notes', e.target.value)} />
         </label>
 
-        {mutation.error && <div className="alert alert--error">{mutation.error}</div>}
+        {submitError && <div className="alert alert--error">{submitError}</div>}
 
         <div className="form-actions">
           <button type="submit" className="btn btn--primary" disabled={mutation.pending}>

gerbil-manager-web/src/strings/de.ts

@@ -97,6 +97,7 @@ export const de = {
         },
         tabPlaceholder: 'Dieser Bereich entsteht in einem späteren Schritt.',
         notFound: 'Diese Rennmaus wurde nicht gefunden.',
+        moreData: 'Weitere Daten',
       },
       // Formular (anlegen/bearbeiten)
       form: {
@@ -184,6 +185,7 @@ export const de = {
       validation: {
         nameRequired: 'Bitte eine Bezeichnung eingeben.',
         dateRequired: 'Bitte ein Wurfdatum angeben.',
+        invalidParentGender: 'Der Vater muss männlich und die Mutter weiblich sein.',
       },
       // Zuchtpaar-Übersicht
       pairs: {
@@ -610,6 +612,7 @@ export const de = {
     no: 'Nein',
     delete: 'Löschen',
     confirmDelete: 'Wirklich löschen?',
+    pageNav: 'Seitennavigation',
   },
   // Genetik-Warnungen: der Engine (src/genetics) liefert nur CODES,
   // die deutschen Texte stehen hier. Schlüssel = GeneticsWarningCode-Werte.