UI Improvements

- [x]  Step 2: Damage feedback (red highlight on sprite)

- [x]  Show Shortcuts UI

    - [x]  UI with icons + responsive

    - [x]  Handle clicks

    - [x]  Show availability

        - [x]  Enough MP

        - [x]  Cooldown Progress

- [x]  Show hit numbers

    - [x]  Regular Attacks (white)

    - [x]  Critical Attacks (Yellow)

    - [x]  Miss attacks (gray)

- [x]  Show Cursor on ground level (Tile instead scene)

- [x]  XP Bar

    - [x]  Show Current level too