frontend: Replace string-based exceptions with std::runtime_error

[gundarapuashwin]

Replace raw const char* throws in initialization with proper std::runtime_error exceptions. This allows localization of error messages and follows C++ best practices.

Fixes #13394

Description

Replaced raw const char* throws in AppInit() with std::runtime_error exceptions. Updated the corresponding catch block in run_program() to catch std::exception instead of const char*.

Motivation and Context

Raw string exceptions cannot be localized and are considered messy error handling. Using proper C++ exception types allows future localization of error messages and follows modern C++ best practices.

How Has This Been Tested?

Ran clang-format-19 locally to ensure style compliance. CI builds are running across Ubuntu, macOS, and Windows platforms to verify compilation.

Types of changes- Bug fix (non-breaking change which fixes an issue)

• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[Warchamp7]

Please make sure to fill out each section of the pull request template.

There are also some other string based exceptions within this file that were missed.

[gundarapuashwin]

Please make sure to fill out each section of the pull request template.

There are also some other string based exceptions within this file that were missed.

Edited and fixed the contents you needed

[Warchamp7]

This is also missing the localization portion of the original Task issue. You can see the helper function QTStr in various places of OBSApp.

Note since you're a new contributor, you only have to worry about updating en-US.ini with localization strings. Translations for other languages are automated.

That being said, some of these errors are before the locale is initialized for the purposes of that helper, so it's gonna need some additional thought for tackling that. It may be that we need an initialization specific helper function that uses the Qt locale rather than the user chosen one from the ini.

[gundarapuashwin]

This is also missing the localization portion of the original Task issue. You can see the helper function QTStr in various places of OBSApp.

Note since you're a new contributor, you only have to worry about updating en-US.ini with localization strings. Translations for other languages are automated.

That being said, some of these errors are before the locale is initialized for the purposes of that helper, so it's gonna need some additional thought for tackling that. It may be that we need an initialization specific helper function that uses the Qt locale rather than the user chosen one from the ini.

done, please check it.