Fix for TreeFieldComponent (#12519)

- Prevent deselect by clicking on same entry
- Updated playwright tests

src/frontend/src/components/forms/fields/TreeField.tsx

@@ -384,6 +384,7 @@ function TreeFieldComponent({
             }}
             searchable
             filter={() => true}
+            allowDeselect={false}
             clearable={showNavigateSection ? false : !definition.required}
             rightSection={navigateRightSection}
             rightSectionPointerEvents={showNavigateSection ? 'all' : undefined}

src/frontend/tests/pages/pui_part.spec.ts

@@ -1190,7 +1190,15 @@ test('Parts - Import supplier part', async ({ browser }) => {
   await page
     .getByRole('button', { name: 'action-button-import-part-BOLT-Steel-M5-5' })
     .click();
+
+  await page.waitForLoadState('networkidle');
   await page.waitForTimeout(250);
+
+  await page
+    .getByRole('textbox', { name: 'tree-field-field' })
+    .fill('electronics');
+  await page.getByText('ElectronicsElectronic').click();
+
   await page
     .getByRole('button', { name: 'action-button-import-part-now' })
     .click();