Feature - Add User Bases Page

[iz-120]

Closes: #10

This pull request introduces a new and improved "User Bases" page, allowing users to view, search, sort, and access the creation flow of knowledge bases in a user-friendly and visually consistent way.

Features

Knowledge Bases Listing

• Displays all user knowledge bases as interactive cards.
• Each card shows:
  • Base title
  • Number of files and total storage used
  • Creation date
  • Last modification date
  • Number of chat credits used
• Cards have a hover effect for better interactivity and are clickable for navigation to be implemented.

Search and Filtering

• Added a search input to filter knowledge bases by name in real time.
• The search input uses consistent text and border colors with the rest of the application, including in dark mode.

Sorting

• Users can sort the list of bases by:
  • Name (A-Z or Z-A)
  • Creation date (ascending/descending)
  • Last modification date (ascending/descending)
• Sorting buttons are styled to match the application's design system and remain visible in both light and dark modes.

Create New Base

• Added a "Nova base" button with a "+" icon, positioned immediately to the right of the search input for easy access.
• The button should navigate to the knowledge base creation flow in future issues.

Layout and Responsiveness

• The page layout is aligned with the sidebar, with appropriate left padding (pl-80) to ensure consistent spacing.
• All controls (search, create, sorting) are aligned and responsive, maintaining their positions regardless of search results.
• Uses Tailwind and project component classes for consistent styling.

Data

• Uses mock data for demonstration, ready to be replaced with real backend data.

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This PR delivers a foundation for knowledge base management, making it easy for users to find, organize, and create their bases with a modern and intuitive interface.