fix: scope wrapped caret geometry repair to web content

[akramj13]

Summary

• Scope wrapped AXStaticText union-frame rejection to web-rendered fields.
• Preserve native Word paragraph geometry while retaining the Claude Desktop repair.
• Update SamplingConfig initialization for CotabbyInference compatibility.
• Add coverage for web/native geometry classification and bundle detection.

Testing

• Added unit tests for caret placement and web-content detection.
• Not run (not requested)