[Favorites] Create UI to show all saved/added to favorites activities

[Rushi-faldu]

Purpose

We need to create a user interface where the user can find all the activities he has added to favorites when the session ended.

User story

As a user, I want to view and manage my saved activities, so that I can quickly replay an activity or edit its details to fit my preferences.

Acceptance criteria

Saved activities are displayed as individual cards. Each card includes:

• Activity name.

• "Replay" button.

• "Edit" button.

• Clicking the "Replay" button for an activity starts the activity immediately. See ticket: [Playtime Session] Start a favourite activity by clicking 'Replay' #109

• Clicking the "Edit" button opens a modal for the selected activity. See ticket: [Favorites] Update details for saved/added to favorites playtime activities #111

Design notes

• Wireframes are here

• Design specifics are here

---

Definition of Done (DoD)

• The feature has been fully implemented, thoroughly tested, and integrated into the app with no critical bugs or performance issues.
• Manual testing is complete, verifying that the feature meets all acceptance criteria.
• Big features are documented inside the code, with clear explanations of functionality, usage, and any relevant edge cases.
• The feature has undergone peer review, with the code approved by at least one other team member to ensure quality and maintainability.
• The feature branch has been successfully merged into the main branch, and the pull request is closed and the branch is deleted.
• The feature’s UI/UX has been reviewed to ensure consistency and alignment with design guidelines.