Find and fix bugs

[sonthepham-dev]

Fix multiple buffer overflow vulnerabilities and uninitialized static variables to improve stability and memory safety.

This PR addresses several critical bugs:

• Adds bounds checking to insertState, insertKey, and restoreLastTypingState functions to prevent buffer overflows.
• Initializes all static variables in Engine.cpp to prevent undefined behavior.
• Replaces a direct vector assignment with a proper copy operation to ensure data integrity.
• Introduces a CHR_SAFE macro for safer array access with bounds checking.

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