feat(myCANAL): enhance content display and fix various display issues

[ByZorks]

Description

• Use 'Watching' type with settings to display show title as activity name
• Fix live channel support with cached channel images and names
• Display movie and episode synopsis
• Extract content handlers into dedicated functions for better maintainability
• Add cache logic to prevent data loss when player controls disappear
• Add largeImageText for all content types

Acknowledgements

• I read the Activity Guidelines
• I linted the code by running npm run lint
• The PR title follows the repo's commit conventions

Screenshots

Proof showing the creation/modification is working as expected