fix: use non-blocking dialog when settings.json is corrupted

[Kirtan-pc]

Description

Fixes startup blocking when settings.json is corrupted by removing the synchronous modal dialog from the settings load path.

Changes

• Replaced blocking dialog.showMessageBoxSync() with the async dialog.showMessageBox() in settingsStore.load().
• Default settings are now returned immediately, so app initialization completes without waiting for user input.
• The corruption warning is shown asynchronously, so startup no longer hangs on headless systems or automated environments.
• Corrupted settings file is still backed up and defaults are still applied.
• Tray/system notification behavior is preserved.

Related Issue

Closes #405

Testing

• Verified all 43 unit tests pass with:

npm test

• Verified whitespace and formatting checks:

git diff --check

Benefits

• App startup no longer blocks when settings.json is corrupted.
• Headless systems and automated environments can launch and initialize without a dismissible dialog.
• Users are still informed about the reset via the async dialog and system notification.

[vercel]

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[github-actions]

🎉 Congratulations @Kirtan-pc! 🎉

Your pull request has been successfully merged into Paraline! Thank you so much for your valuable contribution and effort. Every single improvement helps make Paraline a better desktop experience for everyone! 🙌

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