inspector: fix display for fractional pixel sizes (#8179)

src/inspector/Inspector.zig

@@ -756,7 +756,7 @@ fn renderSizeWindow(self: *Inspector) void {
             {
                 _ = cimgui.c.igTableSetColumnIndex(1);
                 cimgui.c.igText(
-                    "%d px",
+                    "%.2f px",
                     self.surface.font_size.pixels(),
                 );
             }