08: Migrate & redesign Blog, Ads, and Dashboard pages

- Blog listing page with hero, responsive grid, tag filters, load more
- Blog post page with markdown rendering, related posts, social share
- Ads landing page with conversion copy, pricing, FAQ, testimonials
- Dashboard shell with sidebar, topbar, stat cards, activity feed
- Dashboard components: Sidebar, TopBar, StatCard, ActivityFeed, QuickActions
- Comprehensive test suite covering all pages and components

web/src/components/dashboard/index.ts

@@ -0,0 +1,5 @@
+export { default as Sidebar } from "./Sidebar";
+export { default as TopBar } from "./TopBar";
+export { default as StatCard } from "./StatCard";
+export { default as ActivityFeed } from "./ActivityFeed";
+export { default as QuickActions } from "./QuickActions";