Add LEA Pulse app to Framework7 Showcase

[andreboil]

This pull request adds LEA Pulse, the official mobile app of the LEA Blockchain, to the Framework7 Showcase.

App Info

• Name: LEA Pulse
• Description: The official mobile gateway to the LEA Blockchain — a secure community app combining post-quantum wallet technology, XP rewards, and modular blockchain interaction.
• Platforms: iOS & Android
• Website: https://getlea.org
• Play Store: https://play.google.com/store/apps/details?id=com.lea.pulse
• App Store: https://apps.apple.com/app/lea-pulse/id6748052697