feat: Make Lucide icons globally available without Stimulus controller

- Replace unpkg CDN with npm package import in application.js
- Add global initialization for all Lucide icons on page load and Turbo events
- Remove dependency on lucide_controller.js and data-controller wrapper
- Icons now work anywhere with simple <i data-lucide="icon-name"></i> syntax
- Bundle size increased to include full icon set but removes controller overhead

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

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

app/javascript/application.js

@@ -6,3 +6,18 @@ import "@hotwired/turbo-rails";
 
 // Import all Stimulus controllers
 import "./controllers";
+
+// Import and initialize Lucide icons globally
+import { createIcons, icons } from 'lucide';
+
+// Initialize icons globally
+function initializeLucideIcons() {
+  createIcons({ icons });
+}
+
+// Run on initial page load
+document.addEventListener('DOMContentLoaded', initializeLucideIcons);
+
+// Run on Turbo navigation (Rails 7+ SPA behavior)  
+document.addEventListener('turbo:render', initializeLucideIcons);
+document.addEventListener('turbo:frame-render', initializeLucideIcons);