Testing for removed $this->layout() calls:
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✅ PASS: Studies/list.php
✅ PASS: Studies/view.php
✅ PASS: Studies/form.php
✅ PASS: Studies/success.php
✅ PASS: Studies/focused/list.php
✅ PASS: Studies/power/list.php
✅ PASS: Auth/login.php
✅ PASS: Auth/login-success.php
✅ PASS: Auth/logout-success.php
✅ PASS: Auth/signup.php
✅ PASS: Auth/signup-success.php
✅ PASS: Auth/validation-error.php
✅ PASS: Auth/validation-success.php
✅ PASS: error-show.php
✅ PASS: User/edit.php
✅ PASS: User/save.php
✅ PASS: User/view.php
✅ PASS: page-show.php
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Results: 18 passed, 0 failed

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✅ SUCCESS! All templates have been fixed.
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Render Flow After Fix:
1. Controller action returns: ['template' => 'Studies/list', 'data' => [...]]
2. App.handleContentNegotiation() calls: $presenter->render('Studies/list', $data)
3. Presenter.render():
   - Renders the template (Studies/list.php) WITHOUT layout wrapper
   - Takes the rendered content as 'body'
   - Wraps it with layout.php (SINGLE layout wrapper)
4. Result: Single header, single menu, content, single footer

Previous Issue:
- Templates had $this->layout() which wrapped content with layout
- Then Presenter.render() ALSO wrapped with layout
- Result: DOUBLE header, footer, menu rendering

The Fix:
- Removed $this->layout() calls from all templates
- Now ONLY Presenter.render() handles layout wrapping
- Single responsibility principle: ONE place wraps with layout
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