Fix false positive shell injection for user input that is a substring of quoted content

[PopoviciMarian]

Summary by Aikido

Security Issues: 0	🔍 Quality Issues: 2	Resolved Issues: 0

⚡ Enhancements

• Added parseQuoteRegions to identify properly closed quoted regions

🐛 Bugfixes

• Fixed false positive detection when user input was substring of quoted content

🔧 Refactors

• Removed simplistic escape-character checks and centralized dangerous-chars handling

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