[MOB-11504] Fix Persistent Scrollbar in In-App Message Iframes

[pauljung14]

JIRA Ticket(s) if any

• MOB-11504

Description

This PR addresses an issue where in-app message iframes displayed a persistent scrollbar, even when not needed. It also includes a minor cleanup in the example environment file.

Key Changes:

• In-App Message Iframe Scrollbar Fix (src/inapp/inapp.ts):

  • Modified the throttledResize function to temporarily hide iframe body overflow, set the iframe height to match its content, and then restore the overflow. This prevents the scrollbar from appearing unnecessarily.
  • Adjusted the throttle time for resizing from 750ms to 100ms for more responsive adjustments.

• react-example/.env.example Cleanup:

  • Removed commented-out lines related to BASE_URL as it's no longer configured via this environment variable in the example application.

Test Steps

Test that scrollbar appearance occurs as expected when resizing browser window. Be sure to include content blocks such as images that would expand in height when width is changed.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.49%. Comparing base (3948ff5) to head (d280687).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
+ Coverage   74.35%   74.49%   +0.13%     
==========================================
  Files          57       57              
  Lines        2734     2741       +7     
  Branches      816      820       +4     
==========================================
+ Hits         2033     2042       +9     
+ Misses        700      698       -2     
  Partials        1        1              

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[pauljung14]

Only the BASE_URL at the root level .env file does anything.