Tabla periódica - Atomic

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- Added Unit Converter
- Introducing - "Learning-Games" with flashcards to learn the Periodic Table
- Added Grid Properties
- 3D visual of crystal structure
- Element Details now loads faster
- Targets Android 16
- Update PRO Upgrade page
- Minor animation tweaks
- Some initial tablet optimizations (tools page)
- When buying PRO Version, the button PRO fab now correctly hides without restarting app on the main table.