#444 Update finding Claude

• update util

Summary by CodeRabbit

• Bug Fixes

  • Improved binary discovery to run through the user’s login shell (and via where.exe on Windows), respecting shell profiles and custom PATHs while still omitting internal app directories and preserving existing error behavior.

• New Features

  • Added validation to detect and warn about unsafe binary names before attempting discovery.

• UI

  • Replaced static loading text in the diff editor with a spinner and "Loading editor..." label.

• Tests

  • Added comprehensive tests for binary-name validation.

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