Fix batch EDA edit: required validation and pre-populate shared values

- Add required=false to TriStateCheckboxType fields so HTML5 validation
  doesn't force users to check visibility/BOM/board checkboxes
- Pre-populate form fields when all selected parts share the same EDA
  value, so users can see current state before editing

src/Controller/BatchEdaController.php

@@ -18,6 +18,36 @@ class BatchEdaController extends AbstractController
     {
     }
 
+    /**
+     * Compute shared EDA values across all parts. If all parts have the same value for a field, return it.
+     * @param Part[] $parts
+     * @return array<string, mixed>
+     */
+    private function getSharedEdaValues(array $parts): array
+    {
+        $fields = [
+            'reference_prefix' => static fn (Part $p) => $p->getEdaInfo()->getReferencePrefix(),
+            'value' => static fn (Part $p) => $p->getEdaInfo()->getValue(),
+            'kicad_symbol' => static fn (Part $p) => $p->getEdaInfo()->getKicadSymbol(),
+            'kicad_footprint' => static fn (Part $p) => $p->getEdaInfo()->getKicadFootprint(),
+            'visibility' => static fn (Part $p) => $p->getEdaInfo()->getVisibility(),
+            'exclude_from_bom' => static fn (Part $p) => $p->getEdaInfo()->getExcludeFromBom(),
+            'exclude_from_board' => static fn (Part $p) => $p->getEdaInfo()->getExcludeFromBoard(),
+            'exclude_from_sim' => static fn (Part $p) => $p->getEdaInfo()->getExcludeFromSim(),
+        ];
+
+        $data = [];
+        foreach ($fields as $key => $getter) {
+            $values = array_map($getter, $parts);
+            $unique = array_unique($values, SORT_REGULAR);
+            if (count($unique) === 1) {
+                $data[$key] = $unique[array_key_first($unique)];
+            }
+        }
+
+        return $data;
+    }
+
     #[Route('/tools/batch_eda_edit', name: 'batch_eda_edit')]
     public function batchEdaEdit(Request $request): Response
     {
@@ -36,7 +66,9 @@ class BatchEdaController extends AbstractController
             return $redirectUrl !== '' ? $this->redirect($redirectUrl) : $this->redirectToRoute('parts_show_all');
         }
 
-        $form = $this->createForm(BatchEdaType::class);
+        //Pre-populate form with shared values (when all parts have the same value)
+        $initialData = $this->getSharedEdaValues($parts);
+        $form = $this->createForm(BatchEdaType::class, $initialData);
         $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {

src/Form/Part/EDA/BatchEdaType.php

@@ -67,6 +67,7 @@ class BatchEdaType extends AbstractType
             ])
             ->add('visibility', TriStateCheckboxType::class, [
                 'label' => 'eda_info.visibility',
+                'required' => false,
             ])
             ->add('apply_visibility', CheckboxType::class, [
                 'label' => 'batch_eda.apply',
@@ -75,6 +76,7 @@ class BatchEdaType extends AbstractType
             ])
             ->add('exclude_from_bom', TriStateCheckboxType::class, [
                 'label' => 'eda_info.exclude_from_bom',
+                'required' => false,
             ])
             ->add('apply_exclude_from_bom', CheckboxType::class, [
                 'label' => 'batch_eda.apply',
@@ -83,6 +85,7 @@ class BatchEdaType extends AbstractType
             ])
             ->add('exclude_from_board', TriStateCheckboxType::class, [
                 'label' => 'eda_info.exclude_from_board',
+                'required' => false,
             ])
             ->add('apply_exclude_from_board', CheckboxType::class, [
                 'label' => 'batch_eda.apply',
@@ -91,6 +94,7 @@ class BatchEdaType extends AbstractType
             ])
             ->add('exclude_from_sim', TriStateCheckboxType::class, [
                 'label' => 'eda_info.exclude_from_sim',
+                'required' => false,
             ])
             ->add('apply_exclude_from_sim', CheckboxType::class, [
                 'label' => 'batch_eda.apply',