Implement mc-slider component

[Adel2411]

Component: <McSlider ... />

Figma Design: Link to Figma

• Create branch component/mc-slider from dev
• Implement component in packages/web/registry/ui/mc-slider.tsx
• Register in packages/web/registry/registry-ui.ts
• Create demo in packages/web/registry/examples/mc-slider-demo.tsx
• Register in packages/web/registry/registry-examples.ts
• Create Storybook story in packages/web/stories/McSlider.stories.tsx
• Create documentation in packages/web/content/docs/components/mc-slider.mdx
• Test in all 5 themes (light/dark modes)
• Run pnpm run build:registry
• Create PR targeting dev