This commit finalizes the transition from MaterializeCSS to TailwindCSS by:
**Layout & Controller Changes:**
- Consolidated layouts/tailwind.html.erb into layouts/application.html.erb
- Removed `layout 'tailwind'` declarations from 21 controllers
- Removed MaterializeCSS CDN link while preserving Material Icons
**Asset Cleanup:**
- Deleted materialize.min.js (76KB) and materialize-overrides.scss
- Removed tailwind.html.erb (no longer needed)
- Cleaned up MaterializeCSS-specific JavaScript files
**JavaScript Modernization:**
- Removed MaterializeCSS initialization and select components
- Updated autosave.js and timeline-editor.js to remove M.toast() calls
- Deprecated unused React component with MaterializeCSS dependencies
**Result:**
- Unified TailwindCSS layout system across entire application
- Complete removal of MaterializeCSS dependencies
- Preserved all functionality through Alpine.js implementations
- Clean codebase ready for production
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Migrate from deprecated sources API to modern payment_methods API in SubscriptionsController
- Update subscription plan modifications to use Subscription.modify instead of direct assignment
- Fix payment method creation/deletion to use PaymentMethod.create/detach instead of sources
- Update view templates to use new payment_methods data structure
- Migrate price.id usage from deprecated plan.id in data integrity tasks
- Add comprehensive test suite with proper Stripe API stubs
- Add missing test gems: rspec-rails, webmock, factory_bot_rails, shoulda-matchers
This resolves Error 500 when users try to upgrade to Premium subscriptions.
The original error was: NoMethodError - undefined method 'total_count' for nil:NilClass
caused by stripe_customer.sources.total_count when sources API returned nil.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
