Add IPA and syllable mode toggles, fix false IPA on German documents

Backend: Remove en_col_type fallback heuristic (longest avg text) that
incorrectly identified German columns as English. IPA now only applied
when OCR bracket patterns are actually found. Add ipa_mode (auto/all/none)
and syllable_mode (auto/all/none) query params to build-grid API.

Frontend: Add IPA and Silben dropdown selects to GridToolbar. Modes
are passed as query params on rebuild. Auto = current smart detection,
All = force for all words, Aus = skip entirely.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-lehrer/components/grid-editor/GridToolbar.tsx

@@ -1,16 +1,34 @@
 'use client'
 
+import type { IpaMode, SyllableMode } from './useGridEditor'
+
 interface GridToolbarProps {
   dirty: boolean
   saving: boolean
   canUndo: boolean
   canRedo: boolean
   showOverlay: boolean
+  ipaMode: IpaMode
+  syllableMode: SyllableMode
   onSave: () => void
   onUndo: () => void
   onRedo: () => void
   onRebuild: () => void
   onToggleOverlay: () => void
+  onIpaModeChange: (mode: IpaMode) => void
+  onSyllableModeChange: (mode: SyllableMode) => void
+}
+
+const IPA_LABELS: Record<IpaMode, string> = {
+  auto: 'IPA: Auto',
+  all: 'IPA: Alle',
+  none: 'IPA: Aus',
+}
+
+const SYLLABLE_LABELS: Record<SyllableMode, string> = {
+  auto: 'Silben: Original',
+  all: 'Silben: Alle',
+  none: 'Silben: Aus',
 }
 
 export function GridToolbar({
@@ -19,11 +37,15 @@ export function GridToolbar({
   canUndo,
   canRedo,
   showOverlay,
+  ipaMode,
+  syllableMode,
   onSave,
   onUndo,
   onRedo,
   onRebuild,
   onToggleOverlay,
+  onIpaModeChange,
+  onSyllableModeChange,
 }: GridToolbarProps) {
   return (
     <div className="flex items-center gap-2 flex-wrap">
@@ -67,6 +89,30 @@ export function GridToolbar({
         Bild-Overlay
       </button>
 
+      {/* IPA mode */}
+      <select
+        value={ipaMode}
+        onChange={(e) => onIpaModeChange(e.target.value as IpaMode)}
+        className="px-2 py-1.5 text-xs rounded-md border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 text-gray-600 dark:text-gray-400"
+        title="Lautschrift (IPA): Auto = nur bei erkannten englischen Woertern, Alle = fuer alle Vokabeln, Aus = keine"
+      >
+        {(Object.keys(IPA_LABELS) as IpaMode[]).map((m) => (
+          <option key={m} value={m}>{IPA_LABELS[m]}</option>
+        ))}
+      </select>
+
+      {/* Syllable mode */}
+      <select
+        value={syllableMode}
+        onChange={(e) => onSyllableModeChange(e.target.value as SyllableMode)}
+        className="px-2 py-1.5 text-xs rounded-md border border-gray-200 dark:border-gray-700 bg-white dark:bg-gray-800 text-gray-600 dark:text-gray-400"
+        title="Silbentrennung: Original = nur wo im Scan vorhanden, Alle = fuer alle Woerter, Aus = keine"
+      >
+        {(Object.keys(SYLLABLE_LABELS) as SyllableMode[]).map((m) => (
+          <option key={m} value={m}>{SYLLABLE_LABELS[m]}</option>
+        ))}
+      </select>
+
       {/* Rebuild */}
       <button
         onClick={onRebuild}