Add complete Calendar Elements Demo application

Built comprehensive demo app showcasing 24 calendar components:
- 4 Calendar Views (Month, Week, Day, Agenda)
- 4 Date/Time Pickers (Date, Time, Range, Duration)
- 8 Components (Event Card, Mini Calendar, Headers, Forms, etc.)
- 8 Widgets (Heatmap, Today, Badges, Indicators, etc.)

Features:
- Mist theme with animated gradient background and glassmorphism
- Apple theme with clean solid design
- Dark/light mode support
- Responsive design for all screen sizes
- Signal-based reactive state management
- Comprehensive mock data (13+ events, recurrence rules, time slots)
- Interactive navigation and event handling

Tech stack: Angular 19, TypeScript, SCSS, Luxon, RRule

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tsconfig.json

@@ -0,0 +1,30 @@
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "outDir": "./dist/out-tsc",
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "sourceMap": true,
+    "declaration": false,
+    "experimentalDecorators": true,
+    "moduleResolution": "bundler",
+    "importHelpers": true,
+    "target": "ES2022",
+    "module": "ES2022",
+    "lib": [
+      "ES2022",
+      "dom"
+    ]
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}