feat: [five-c] User experience (UX) enhancements

[tdruez]

Issues

• Issue: five-c: Design user experience (UX) #402

Changes

These changes rework the navigation and search UI to improve the overall user experience. The goal is to make the new compliance views and dashboards easier to access and more prominent, with a cleaner top navbar, a dedicated side menu for main navigation, and a redesigned search modal.

Navigation

• Reworked the top navbar, replacing the previous nav-brand dropdown with a cleaner layout
• Added a side menu (offcanvas) for main navigation
• Moved external links to the right nav menu, with a new SHOW_MENU_EXTERNAL_LINKS setting to toggle their visibility
• Removed the SHOW_TOOLS_IN_NAV setting
• Added Requests to the navbar header on large viewports
• Improved focus and hover behavior on navbar buttons
• Various rendering fixes (offcanvas button, anonymous user view, left menu in REST API view, active theme reflected in dropdown)

Search

• Reworked the search UI into a modal displayed from the top
• Refined the search button rendering in the navbar

Screens

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