Add Continue + Recent activity recap to home

Home now ends with the design's two-card recap row: a "Continue where
you left off" card on the left (history list + reading-list cover that
opens the latest item, falling back to the reading list page when the
list is empty) and a "Recent activity" card on the right that shows
visited entries with relative time labels and a "View all history" link.

The previous open-tabs list is dropped from home — the sidebar already
exposes tabs and the design home doesn't repeat them. Source data is
real history_entries / reading_list off the snapshot; nothing is
fabricated. The home page is split into chrome/home/{hero, favorites,
recap, section, style, time}.rs so each file stays under 500 lines, and
internal_pages/new_tab.rs is now a thin shim that calls into it.

crates/ely_app/src/shell/chrome/mod.rs

@@ -1,7 +1,9 @@
+pub(crate) mod home;
 pub(crate) mod sidebar_header;
 pub(crate) mod topbar;
 pub(crate) mod wallpaper;
 
+pub(crate) use home::render_home_page;
 pub(crate) use sidebar_header::render_sidebar_header;
 pub(crate) use topbar::render_topbar;
 pub(crate) use wallpaper::{WallpaperTheme, render_wallpaper};