feat(font): use the full Noto Sans SC font and enlarge the disk

- FontDemo points at /FONTS/FONT.TTF
- build.py installs NotoSansSC-6.ttf as disk/fonts/font.ttf
- grow disk.img from 64 MiB to 256 MiB

Scripts/disk.ps1

@@ -41,7 +41,7 @@ $DISK_IMG = Join-Path $PROJECT_DIR "disk.img"
 $DISK_DIR = Join-Path $PROJECT_DIR "disk"
 $MOUNT_LETTER = "Z:"
 
-$IMAGE_SIZE = 64 * 1024 * 1024
+$IMAGE_SIZE = 256 * 1024 * 1024
 
 Write-Host "=== Creating disk image ===" -ForegroundColor Cyan