feat: implement Portfolio page with base layout

[yhabib]

Motivation

The new page for the Portfolio route features a layout with the following sections:

• Top section
  • TotalAssetsCard: that takes 100% the width when the user is logged in but only 1/3 of the space when the LoginCard is present.
  • LoginCard occupies 2/3 of the space when displayed and appears as the first card on mobile devices.
• Main section
  • Cards will take up 50% of the available space, and the stack will appear on small screens.

Screen.Recording.2024-12-23.at.16.03.24.mov

Changes

• New Portfolio page component
• Renders the new Portfolio page under the Portfolio route
• Displays the appropriate layout in the (app)/(home)/layout when the feature toggle is on; the Portfolio page is the default page

Tests

• Unit tests to verify that the LoginCard renders when the user is not logged in.

Todos

• Add entry to changelog (if necessary).
  Not necessary

[mstrasinskis]

LGTM, just a couple of optional comments.