[feat] Add centerView option to force center template workflows on load

Template workflows were not centering on view when loaded because they
contained saved view position data (extra.ds) from when they were created.
This fix adds a centerView option to loadGraphData that forces centering
regardless of saved view state.

Changes:
- Add centerView option to loadGraphData function
- Update view restoration logic to prioritize centering when centerView is true
- Pass centerView: true when loading template workflows
- Add test to verify centerView option is passed correctly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tests-ui/tests/composables/useTemplateWorkflows.test.ts

@@ -278,6 +278,27 @@ describe('useTemplateWorkflows', () => {
     expect(fetch).toHaveBeenCalledWith('mock-file-url/templates/template1.json')
   })
 
+  it('should load templates with centerView option enabled', async () => {
+    const { app } = await import('@/scripts/app')
+    const { loadWorkflowTemplate } = useTemplateWorkflows()
+
+    // Set the store as loaded
+    mockWorkflowTemplatesStore.isLoaded = true
+
+    // Load a template from the default category
+    await loadWorkflowTemplate('template1', 'default')
+    await flushPromises()
+
+    // Verify that loadGraphData was called with centerView: true
+    expect(app.loadGraphData).toHaveBeenCalledWith(
+      { workflow: 'data' },
+      true,
+      true,
+      'template1',
+      { openSource: 'template', centerView: true }
+    )
+  })
+
   it('should handle errors when loading templates', async () => {
     const { loadWorkflowTemplate, loadingTemplateId } = useTemplateWorkflows()