Issue #16: Code Splitting and Lazy Loading

### Description
Implement code splitting and lazy loading to reduce initial bundle size and improve loading performance.

### Requirements
- [ ] Implement dynamic imports for widgets
- [ ] Add route-based code splitting
- [ ] Create lazy-loaded chart components
- [ ] Implement progressive widget loading
- [ ] Add bundle analysis and optimization
- [ ] Create loading strategies for different network conditions

### Acceptance Criteria
- Initial bundle size is reduced by 40%
- Widgets load progressively as needed
- Charts are loaded only when visible
- Performance metrics show improvement
- Loading strategies adapt to network conditions

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