fix: handle std::bad_alloc and invalid formats on RAW file loading

[for13to1]

Summary of Changes

This PR fixes crashes when opening RAW files with invalid parameters, corrupted headers, or filenames missing resolution indicators. It introduces a multi-layer defense mechanism to prevent integer overflows, out-of-memory crashes, and invalid optional dereferences.

Detailed Changes

1. Resolution Sanity Boundary (Active Defense)

   • Added static constexpr unsigned MAX_DIMENSION = 16384 to the Size struct in YUViewLib/src/common/Typedef.h.
   • Updated Size::isValid() to ensure width and height do not exceed MAX_DIMENSION. This protects all subsequent memory allocation calculations from integer overflow (as 16384 * 16384 * 4 fits within 32-bit signed integer limits) and filters out invalid huge files early.

2. Boundary & Safety Checks

   • Added nrBytes <= 0 and fileStartPos < 0 validation in FileSource.cpp and playlistItemRawFile.cpp to prevent negative container resizing.
   • Added isFormatValid() checking before frame processing in videoHandlerRGB and videoHandlerYUV.
   • Fixed a crash in videoHandlerYUV.h where FrameHandler::getFormatAsString() could return std::nullopt and get dereferenced without validation.

3. Exception Safety & Logging (Passive Defense)

   • Wrapped critical memory allocation functions (readBytes, convertYUVToImage, convertRGBToImage) in try-catch blocks targeting std::bad_alloc.
   • Instead of silently swallowing allocation failures, warnings are logged via qWarning and the frame loader exits gracefully without updating cache indices.

Verification

• Compiled successfully on macOS and Windows.
• Verified that opening invalid RAW files no longer crashes the application.
• All 1860 unit tests in the test suite passed successfully.

[for13to1]

#661