fix: clamp GDI char dimensions in Store_GDI_Char

[seer-by-sentry]

The FontCharsClass::Store_GDI_Char function in render2dsentence.cpp was susceptible to an out-of-bounds read from GDIBitmapBits. This occurred because GetTextExtentPoint32W could return character dimensions (char_size.cx and char_size.cy) that exceeded the pre-allocated GDIBitmap buffer's width (PointSize * 2) or CharHeight.

This fix introduces clamping for char_size.cx and char_size.cy immediately after GetTextExtentPoint32W is called and PixelOverlap/xOrigin adjustments are made. char_size.cx is clamped to width and char_size.cy is forced to CharHeight. This ensures that subsequent loops iterating over the bitmap data (for (int row = 0; row < char_size.cy; row ++) { ... for (int col = 0; col < char_size.cx; col ++) { ... } }) operate strictly within the allocated buffer bounds, preventing the out-of-bounds access and associated crashes.

Fixes CLIENT-53X

_{This PR was automatically generated by Sentry. You can adjust this setting at any time.}

[github-actions]

⚠️ Title/Commit Validation Failed

Invalid PR title:

• fix: clamp GDI char dimensions in Store_GDI_Char

Invalid commit messages:

• fix: clamp GDI char dimensions in Store_GDI_Char
  PR titles and commit messages must follow conventional commits format:

type: Description
type(scope): Description

Allowed types: bugfix, build, chore, ci, docs, fix, feat, perf, refactor, revert, style, test, tweak, unify

See CONTRIBUTING.md for details.