fix(style): use additive line_spacing model (font*1.1 + extra) instead of multiplicative

src/style.rs

@@ -56,7 +56,9 @@ impl StyleProfile {
     }
 
     pub fn line_height(&self) -> f32 {
-        self.font_size * self.line_spacing
+        // egui actual line height is approximately font_size * 1.1
+        // line_spacing adds extra (line_spacing - 1.0) * font_size * 0.5 as extra gap
+        self.font_size * 1.1 + self.font_size * (self.line_spacing - 1.0).max(0.0) * 0.5
     }
 
     pub fn apply_to_text(&self, text: &str) -> String {