SDK-31 Fix full-position IAM safe area handling

[sumeruchat]

What

Fixes full-position in-app messages not covering the entire screen edge-to-edge. Previously, full-position IAMs would not extend behind the notch/Dynamic Island and home indicator areas, leaving gaps where the underlying app content was visible.

Changes

• Modified resizeWebView in IterableHtmlMessageViewController to use screen bounds for full-position IAMs
• Added coordinate conversion to properly position the webView relative to the view's coordinate system
• Non-full positions (top, bottom, center) remain unchanged

Impact

• Breaking changes: None
• Behavior change: Full-position IAMs now truly cover the entire screen edge-to-edge, including behind the notch/Dynamic Island and home indicator
• Other positions: Top, bottom, center positions unaffected (original behavior preserved)

Testing

How to test:

1. Create an in-app message with full position (top=0%, bottom=0%)
2. Display on device with notch/Dynamic Island (iPhone X or newer)
3. Verify background extends all the way to screen edges (behind status bar and home indicator)
4. Test top/bottom/center positions still work correctly

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 69.73%. Comparing base (e5176d4) to head (521326e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...k/Internal/IterableHtmlMessageViewController.swift	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #996   +/-   ##
=======================================
  Coverage   69.73%   69.73%           
=======================================
  Files         111      111           
  Lines        8983     8995   +12     
=======================================
+ Hits         6264     6273    +9     
- Misses       2719     2722    +3     

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