fix: increase default window height to prevent color picker popover scrollbars

src/main.rs

@@ -40,7 +40,7 @@ fn main() -> glib::ExitCode {
             .application(app)
             .title("Icon Color Tool")
             .default_width(900)
-            .default_height(650)
+            .default_height(800)
             .build();
 
         let stack = Stack::new();