feat(portal): align navbar and sidebar with figma style, add notifica…

[digmunhoz]

Description

Updates the portal navbar and sidebar to match the figma layout: compact logo (Tron cube + "by Grid Labs"), organization selector next to the logo with a vertical separator, notification bell with dropdown (empty state: "No new notifications"), and search bar kept in the sidebar. Adds dashboard icon (LayoutDashboard) and "Dashboard" label, and switches all user-facing portal text to English (notifications, loading, search placeholders, login/clusters/users placeholders, AdminRoute/ProtectedRoute messages).

Related Issue

Closes #

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📚 Documentation update
• 🔧 Refactoring (no functional changes)
• 🧪 Tests (adding or updating tests)
• 🏗️ Infrastructure/CI changes

Component Affected

• API (backend)
• Portal (frontend)
• Documentation
• CI/CD
• Other:

Checklist

General

• I have read the CONTRIBUTING.md guidelines
• My code follows the project's code style
• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• My changes generate no new warnings or errors

Testing

• I have added tests that prove my fix/feature works
• New and existing unit tests pass locally with my changes
• I have tested my changes manually

Documentation

• I have updated the documentation accordingly
• I have updated the README if needed

Screenshots (if applicable)

Optional: screenshot of navbar (logo, org selector, bell, user menu) and sidebar (search, Dashboard, menu items).

Test Plan

1. Run portal locally (npm run dev in portal/), log in, and confirm navbar: compact logo, org selector with vertical bar, bell, user menu.
2. Click bell and confirm dropdown shows "No new notifications"; click outside and open user menu to confirm dropdowns close correctly.
3. Confirm sidebar: search at top, "Dashboard" item with LayoutDashboard icon, link styling (active/inactive). Collapse/expand and confirm search and labels.
4. Navigate through Login, AdminRoute, ProtectedRoute, DataTable, Clusters, Users and confirm all visible text is in English.

Additional Notes

• No API calls were changed; org selector still uses useOrganization() and user.organizations.
• Figma style was applied by copy/adaptation in the portal, with no dependency or link to the figma/ directory.
• Text switched to English: notifications, loading, search placeholders, your@email.com, my-cluster, user@example.com, AdminRoute and ProtectedRoute messages.