feat: expand Intel GPU display management

programs/include/gui/font.hpp

@@ -14,8 +14,10 @@ namespace gui {
 static constexpr int FONT_WIDTH = 8;
 static constexpr int FONT_HEIGHT = 16;
 
-// Defined in font_data.cpp
-extern const uint8_t font_data[256 * 16];
+// Defined by programs that ship the built-in VGA fallback. Keep the symbol
+// weak so Canvas remains usable by small apps that intentionally rely only on
+// TrueType fonts, while login/desktop can recover when TrueType setup fails.
+extern const uint8_t font_data[256 * 16] __attribute__((weak));
 
 // Dynamic font height: TTF line height or 16 (bitmap fallback)
 inline int system_font_height() {