Redesign sidebar with hierarchical navigation

CHANGELOG.md

@@ -16,6 +16,7 @@
 - Moves language and theme preferences from the sidebar footer into a dedicated Settings → Interface page.
 - Replaces expandable sidebar groups with a flatter, quieter navigation structure that exposes destinations directly.
 - Reorganizes sidebar destinations under Control Panel, Jobs, Job Review, Settings, and Administration.
+- Redesigns the sidebar as a true top-level and collapsible submenu hierarchy with clearer active states.
 - Raises Light and Dark theme text, border, control, and status contrast, with stronger Dark-mode readability.
 
 ## 19.0.0 — Application Workspace

README.md

@@ -162,9 +162,10 @@ and high-contrast text and surfaces in both color modes. Open **Settings → Int
 and select **System**, **Light**, or **Dark**. Preferences are stored only in the browser; System follows the
 operating-system color scheme.
 
-The sidebar organizes every destination under five stable workspace sections: **Control Panel**, **Jobs**,
-**Job Review**, **Settings**, and **Administration**. Its search field filters pages directly, while the compact
-mode keeps only page icons for narrow workspaces.
+The sidebar uses five stable top-level destinations: **Control Panel**, **Jobs**, **Job Review**, **Settings**,
+and **Administration**. Primary workspaces open directly, related pages live in compact collapsible submenus, and
+the active group expands automatically. Navigation search, keyboard focus, mobile behavior, and icon-only compact
+mode remain available.
 
 Job Review cards show only the role, company, location, Overall Fit, work arrangement, freshness, and review actions.
 Select a card—or focus it and press Enter—to open the complete detail view. The original job site opens only from