Redesign plugin detail page in design's 320 + 1fr grid

Plugin detail now opens with the design's marketplace card: a
4/3 brand-gradient cover plus install/secondary buttons plus a
permissions list with risk badges on the left, and a category
overline plus serif Newsreader title plus description plus a
4-up real-data stat grid (permissions, high-risk, contributes,
signature) plus a "What it adds to ELY" contributions list on
the right. Every value comes from PluginManifest — no fabricated
ratings, install counts, or feature copy.

Internal: chrome::plugin_detail_view holds the layout, and
chrome::plugin_labels owns the permission scope labels and
contribution copy so plugin_detail_view stays under 500 lines.
The internal_pages/plugin_details.rs shim only handles route
parsing and the missing-plugin fallback.

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

@@ -3,6 +3,8 @@ pub(crate) mod brand_glyph;
 pub(crate) mod command_footer;
 pub(crate) mod command_overlay;
 pub(crate) mod home;
+pub(crate) mod plugin_detail_view;
+pub(crate) mod plugin_labels;
 pub(crate) mod settings_layout;
 pub(crate) mod sidebar;
 pub(crate) mod sidebar_header;
@@ -15,6 +17,7 @@ pub(crate) use appearance_form::render_appearance_form;
 pub(crate) use brand_glyph::render_glyph_for;
 pub(crate) use command_overlay::render_command_overlay;
 pub(crate) use home::render_home_page;
+pub(crate) use plugin_detail_view::render_plugin_detail_view;
 pub(crate) use settings_layout::render_settings_landing;
 pub(crate) use sidebar::{PANEL_BG, panel_shadow};
 pub(crate) use sidebar_header::render_sidebar_header;