Uses windowed setting in shebang processing to avoid using the console.

[zooba]

Fixes #216

[Copilot]

Pull request overview

This pull request adds support for a windowed parameter to shebang processing, allowing scripts to be launched with GUI-mode executables instead of console executables on Windows. This addresses issue #216 by enabling proper windowed behavior when launching Python scripts.

Changes:

• Added windowed keyword-only parameter to shebang processing functions (_find_shebang_command, _parse_shebang, _read_script, find_install_from_script)
• Implemented logic to substitute windowed aliases when windowed=True is requested
• Updated integration point in commands.py to pass the windowed parameter through to script processing
• Added comprehensive tests for windowed shebang behavior with 25 new test cases

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/manage/scriptutils.py	Added windowed parameter to all shebang processing functions and implemented logic to substitute windowed executables when requested
src/manage/commands.py	Updated get_install_to_run to pass windowed parameter to find_install_from_script
tests/test_scriptutils.py	Added test data for windowed aliases, new test_read_shebang_windowed test with 25 cases, and updated existing tests to explicitly pass windowed=False

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