DirectWrite Font Face Resolution Patch

Description

Adds ResolveFontFace() function to resolve font face names (e.g., "Cascadia Mono Light", "Iosevka Oblique") into proper DirectWrite parameters (family name + weight/style/stretch).

Uses IDWriteGdiInterop::CreateFontFromLOGFONT() to correctly resolve font parameters that would otherwise cause DirectWrite to fail silently and fall back to a generic system font.

Issues Fixed

• #4150 - Variable fonts (Iosevka) fallback
• #5410 - Global Default Font not applying
• #5455 - Cascadia Mono Light breaks rendering

Based On

• Scintilla Bug #2080 - D2D bug with font family/face name
• Scintilla MR #36 - DirectWrite font resolution

Files Modified

• scintilla/win32/SurfaceD2D.cxx

Changes

1. Added ResolveFontFace() function (~70 lines) before FontDirectWrite struct
2. Modified FontDirectWrite constructor to call ResolveFontFace() first, with fallback