ProtonOS Update (v-6.5)

• Added a clean top bar with a live clock and date.
• Created a lightweight Calculator app using Flexbox.
• Added smooth Y-axis animations for UI elements.
• Learned and implemented CSS pseudo-elements and @keyframes animations.
• Standardized the app UI—future apps will reuse the same interface, with only layout positions and underlying logic changing.
  looking forward to (v-7.0)