fix: handle templates with no steps in sync download

When downloading a template that has no steps defined, `result.content.steps`
is undefined. JSON.stringify strips undefined values, so after writing and
reading the file back, the `steps` property would be missing.

Use nullish coalescing to default to empty object: `steps ?? {}`

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

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

Author: kvz

src/cli/templates.ts

@@ -317,7 +317,8 @@ export async function sync(
 
     const result = await client.getTemplate(templateId)
 
-    template.data.steps = result.content.steps
+    // Use empty object if template has no steps (undefined would be stripped by JSON.stringify)
+    template.data.steps = result.content.steps ?? {}
     const file = path.join(path.dirname(template.file), `${result.name}.json`)
 
     await fsp.writeFile(template.file, JSON.stringify(template.data))