Optimize CSS architecture with SCSS modular system

## Major CSS/SCSS Improvements
- ✅ Set up modular SCSS architecture with variables, mixins, and components
- ✅ Created organized directory structure: src/scss/ with variables, mixins, pages/
- ✅ Removed ~300+ lines of inline CSS from admin.html
- ✅ Added comprehensive design system with consistent spacing, colors, typography
- ✅ Created reusable mixins for buttons, cards, tables, forms, and layouts
- ✅ Implemented responsive breakpoint mixins for mobile/tablet/desktop
- ✅ Added utility classes for common layouts and spacing

## Build System
- ✅ Added sass and concurrently as dev dependencies
- ✅ Created npm scripts: build-css, watch-css, dev-with-css
- ✅ Automated SCSS compilation to compressed CSS
- ✅ Set up development workflow with CSS watching

## Admin Panel Enhancements
- ✅ Added complete tab navigation system (Location Reports + Profanity Filter)
- ✅ Integrated profanity management UI with forms and tables
- ✅ Consistent styling across all components using SCSS mixins
- ✅ Improved responsive design for mobile devices

## Benefits
- 🎯 Maintainable: All styles centralized in modular SCSS files
- 📱 Responsive: Better mobile experience with consistent breakpoints
- 🎨 Consistent: Design system ensures visual consistency
- ⚡ Efficient: Compressed CSS output, no inline styles
- 🔧 Developer-friendly: Easy to extend and modify styles

The application now has professional-grade CSS architecture that's easy to maintain and extend.

package.json

@@ -5,7 +5,11 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
-    "dev": "nodemon server.js"
+    "dev": "nodemon server.js",
+    "build-css": "sass src/scss/main.scss public/style.css --style=compressed",
+    "watch-css": "sass src/scss/main.scss public/style.css --watch",
+    "dev-with-css": "concurrently \"npm run watch-css\" \"npm run dev\"",
+    "build": "npm run build-css"
   },
   "dependencies": {
     "cors": "^2.8.5",
@@ -15,7 +19,9 @@
     "sqlite3": "^5.1.6"
   },
   "devDependencies": {
-    "nodemon": "^3.0.1"
+    "concurrently": "^9.2.0",
+    "nodemon": "^3.0.1",
+    "sass": "^1.89.2"
   },
   "keywords": [
     "ice",