Enable TypeScript strict mode and fix all type errors

- Enable strict: true in tsconfig.json (was false)
- Add proper interfaces for all component props (Dashboard, Comparison, Slides)
- Add SlideConfig, ChartTypeOption, MetricOption types
- Type all function parameters, callbacks, and state variables
- Fix dynamic property access with proper keyof assertions
- 233 type errors resolved across 5 files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/config/chartConfig.ts

@@ -49,7 +49,7 @@ export const createDataLabelConfig = (showDataLabels: boolean): any => ({
   backgroundColor: 'rgba(255, 255, 255, 0.85)',
   borderRadius: 3,
   textDirection: 'ltr', // Force LTR for numbers - fixes RTL misalignment
-  formatter: (value) => {
+  formatter: (value: number | null) => {
     if (value == null) return '';
     if (value >= 1000000) return (value / 1000000).toFixed(2) + 'M';
     if (value >= 1000) return (value / 1000).toFixed(2) + 'K';