feat(win32 gui): add adjust_fontsize command to zoom in/out

src/renderer/win32/renderer.zig

@@ -371,6 +371,11 @@ fn update_window_style(self: *Self) void {
     }
 }
 
+pub fn adjust_fontsize(self: *Self, amount: f32) void {
+    const hwnd = self.hwnd orelse return;
+    gui.adjust_fontsize(hwnd, amount);
+}
+
 pub fn set_terminal_cursor_color(self: *Self, color: Color) void {
     _ = self;
     _ = color;