Feature/dropdown in modal

[Daviti-Gogniashvili]

Implemented robust modal positioning system for phone input dropdown to prevent overflow issues and ensure proper visibility across different viewport sizes and scroll positions

Changes:

• Added dynamic modal positioning that calculates optimal placement (above/below input)
• Implemented window resize handling with debounced recalculation
• Added two-phase positioning: initial estimates followed by precise positioning after render
• Enhanced dropdown state management to track modal position
• Added proper cleanup to prevent body overflow and state loops

Technical Details:

• Uses getBoundingClientRect() for accurate viewport positioning
• Handles edge cases: viewport boundaries, insufficient space, window resize
• Prevents layout shifts with immediate initial positioning
• Maintains performance with debounced resize events (100ms)
• Safe cleanup on component unmount and all dropdown close scenarios

[Daviti-Gogniashvili]

@bl00mber pls this feature is must have as simple dropdown causes overflow issues and layout shifts in dialogs