fix: resolve integer overflow in BG0 Drawing

src/Bus.zig

@@ -57,7 +57,10 @@ pub fn read32(self: *const Self, addr: u32) u32 {
         0x0A00_0000...0x0BFF_FFFF => self.pak.get32(addr - 0x0A00_0000),
         0x0C00_0000...0x0DFF_FFFF => self.pak.get32(addr - 0x0C00_0000),
 
-        else => std.debug.panic("32-bit read from 0x{X:0>8}", .{addr}),
+        else => blk: {
+            log.warn("32-bit read from 0x{X:0>8}", .{addr});
+            break :blk 0x0000_0000;
+        },
     };
 }
 

src/ppu.zig

@@ -114,7 +114,7 @@ pub const Ppu = struct {
             // and then we can index the palette
             const pal_id = if (!is_8bpp) blk: {
                 tile = if (col & 1 == 1) tile >> 4 else tile & 0xF;
-                const pal_bank: u8 = @as(u8, entry.palette_bank.read()) << 4;
+                const pal_bank: u16 = @as(u8, entry.palette_bank.read()) << 4;
                 break :blk pal_bank | tile;
             } else tile;