Replace div/CSS-class approach with nested table layout so the 600px
container is enforced via HTML attributes, not a <style> block that
Outlook strips. Also removes border-radius and display:inline-block.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Remove html-shell entries from InitialSchema Seed() method
- Create new AddHtmlShellTemplates migration to insert html-shell templates
- Prevents duplicate key errors from having same data in two migrations
- InitialSchema seeds 32 templates (16 keys × 2 languages)
- AddHtmlShellTemplates seeds 2 html-shell templates (start, end)
- Total: 34 templates after both migrations run
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>