docs: update ROADMAP and README with recent features

- Add Mobile Bottom Navigation section to ROADMAP
- Update routes table in README (collections routes)

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

README.md

@@ -106,7 +106,8 @@ assets/css/
 | Path | Description |
 |------|-------------|
 | `/` | Shop home page |
-| `/products` | Products listing |
+| `/collections/all` | All products |
+| `/collections/:slug` | Category collection (filterable) |
 | `/products/:id` | Product detail page |
 | `/cart` | Shopping cart |
 | `/about` | About page |

ROADMAP.md

@@ -472,3 +472,11 @@ The project is currently named `simpleshop_theme` (reflecting its origins as a t
 - `social_links_card` component with icon + text label cards
 - Contact form with integrated email link and response time
 - Reorganized layout: contact form left, info cards right
+
+### Mobile Bottom Navigation ✅
+- Fixed bottom tab bar for thumb-friendly mobile navigation
+- Icons + labels for Home, Shop, About, Contact
+- Active page has accent-colored background highlight
+- Shadow above nav for visual separation
+- Hidden on desktop (≥768px), replaces header nav on mobile
+- Works in both live shop and theme preview modes