Fix #6294: 🐛 Fix inline range datepicker resetting selection on handleSelect

[balajis-qb]

Description

Linked issue: #6294 & #6304

Problem
The handleSelect handler unconditionally calls setOpen(false). While this behavior is correct for non-inline datepickers (which should close after selection), it causes unintended side effects in inline mode.

Inline datepickers do not close, but invoking setOpen(false) still triggers a focus reset. This results in the component switching back to selecting startDate, effectively losing the current range selection and creating a broken user experience.

Changes

• Added a conditional check to skip calling setOpen(false) when the datepicker is in inline mode
• Preserved existing behavior for non-inline datepickers
• Prevented unnecessary focus resets that were causing selection state loss

Behavior Changes

• Inline mode: Range selection is preserved correctly after selecting dates
• Non-inline mode: No change; picker continues to close after selection

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.32%. Comparing base (548a1f3) to head (05ecbbb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6296      +/-   ##
==========================================
+ Coverage   99.29%   99.32%   +0.02%     
==========================================
  Files          30       30              
  Lines        3822     3825       +3     
  Branches     1648     1668      +20     
==========================================
+ Hits         3795     3799       +4     
+ Misses         26       25       -1     
  Partials        1        1              

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