feat(beheer): WP-32 — undo/redo for the stamdata table editor

Wire the WP-31 createHistory helper into StamdataStore: per-table undo/redo
over the edited rows, recording only real edits and restoring via the existing
Seed msg. Ctrl/Cmd+Z / +Shift+Z, deferring to native text-undo inside grid
cell inputs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/locale/messages.en.xlf

@@ -3598,6 +3598,23 @@
           <context context-type="linenumber">27</context>
         </context-group>
       </trans-unit>
+
+<trans-unit id="beheer.undo" datatype="html">
+        <source>Ongedaan maken</source>
+        <target datatype="html">Undo</target>
+        <context-group purpose="location">
+          <context context-type="sourcefile">src/app/beheer/ui/stamdata-table-editor/stamdata-table-editor.component.ts</context>
+          <context context-type="linenumber">237</context>
+        </context-group>
+      </trans-unit>
+<trans-unit id="beheer.redo" datatype="html">
+        <source>Opnieuw uitvoeren</source>
+        <target datatype="html">Redo</target>
+        <context-group purpose="location">
+          <context context-type="sourcefile">src/app/beheer/ui/stamdata-table-editor/stamdata-table-editor.component.ts</context>
+          <context context-type="linenumber">238</context>
+        </context-group>
+      </trans-unit>
     </body>
   </file>
 </xliff>