Add prevention of collapse during text selection

[jdamon96]

Fixes an issue where the JSON tree would unexpectedly collapse when users drag to select text content within JSON values.

Problem:

• Users dragging to select text in JSON values would cause the entire tree to collapse on mouse release
• This occurred because the
  element's click handler (toggleExpand) was triggered by the click event generated at the end of text selection

  Solution:

  • Added intelligent click detection that distinguishes between intentional collapse clicks and clicks resulting from text selection
  • Tracks mouse down/up events and checks for active text selection using window.getSelection()
  • Prevents collapse when:
    • Mouse target changes between down/up (indicating drag)
    • Time between mouse down/up exceeds 200ms (indicating drag)
    • Active text selection is detected