Summary of Improvements

I've successfully implemented all four requested improvements to make the SimpleShop Theme Studio more aligned with the demo file and UK-centric:
1. ✅ Made all links and buttons functional

Updated components:

    Header navigation (preview_pages.ex): Home, Shop, About, and Contact links now trigger page navigation
    Product cards (home.html.heex, collection.html.heex): Clicking any product card navigates to the PDP page
    Footer links (preview_pages.ex): All footer navigation links are now functional
    CTA buttons (home.html.heex): "Shop the collection" and "View all products" buttons navigate to collection page
    About link (home.html.heex): "Learn more about the studio" link navigates to about page

All links now use phx-click="change_preview_page" with phx-value-page to switch between the 7 preview pages seamlessly.
2. ✅ Implemented floating cart drawer/sidebar

New component added (preview_pages.ex:229-320):

    Created cart_drawer/1 function component matching the demo's design exactly
    Includes cart header with "Your basket" title
    Displays cart items with images, names, variants, and prices
    Shows subtotal (£72.00)
    Checkout button and "View basket" link
    Close button and overlay with click-to-close functionality
    Smooth slide-in animation from the right
    Added to all 7 preview pages (home, collection, pdp, cart, about, contact, error)

Cart drawer data (preview_data.ex:34-49):

    Added cart_drawer_items/0 function with UK-themed products:
        Autumn Fern (A4 / Unframed) - £24.00
        Wild Roses (A3 / Oak frame) - £48.00

3. ✅ Added cart count badge to cart icon

Updated header (preview_pages.ex:98-112):

    Added circular badge showing "2" items
    Badge styled with accent color background
    Positioned at top-right of cart icon
    Font size: 11px, white text, rounded pill shape
    Matches the demo implementation exactly

Cart button functionality:

    Clicking the cart icon now opens the cart drawer
    Uses Phoenix.LiveView.JS.add_class to toggle visibility

4. ✅ Updated all content to UK English and currency

Language changes:

    "Shopping Cart" → "Your basket"
    "Add to Cart" → "Add to basket"
    "Free Shipping" → "Free Delivery"
    "Shipping" (in fees) → "Delivery"
    "You May Also Like" → "You might also like"
    Footer: "Shipping" → "Delivery"

Currency changes:

    All product prices: $ → £ (across all 7 preview pages)
    Announcement bar: "$50" → "£40"
    Free delivery threshold: "$50" → "£40"
    Cart delivery fee: "$10.00" → "£8.00"
    Cart tax: "$8.50" (Tax) → "£7.20" (VAT 20%)
    Cart drawer subtotal: "$72.00" → "£72.00"

Files modified:

    lib/simpleshop_theme_web/live/theme_live/preview_pages.ex - Header, footer, announcement bar, new cart drawer component
    lib/simpleshop_theme/theme/preview_data.ex - Added cart drawer items function
    All 7 preview page files (home, collection, pdp, cart, about, contact, error) - Currency symbols and cart drawer component

The implementation now closely matches the demo.html file functionality while being fully localized for the UK market with British English tone and £ currency throughout.