Interface size in finer percent steps; fixed sizes no longer double the interface

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main.rs

@@ -475,7 +475,6 @@ fn next_seed(seed: u32) -> u32 {
 
 fn apply_settings(s: &Settings, r3d: &mut R3d) {
     i18n::set_language(&s.language);
-    ui::set_ui_factor(s.ui_factor);
     r3d.outlines = s.outlines;
     r3d.set_wall_detail(s.wall_subdivisions());
     r3d.max_lights = s.max_lights as usize;
@@ -993,10 +992,11 @@ async fn main() {
         let need: u32 = 900;
         // measured on the shorter side: upright (portrait) the width gets those pixels and the
         // height grows with the screen, so the world and the menus keep their size. The setting
-        // "interface size" picks the interface pixels per world pixel: large 2, medium 3, small 4
-        let short = match app.settings.ui_factor {
-            k @ 2..=4 => rows * k as u32,
-            _ => rows * need.div_ceil(rows),
+        // "interface size" picks the interface rows in percent of the standard (100% = 1080 rows);
+        // on a screen with fewer rows the interface stays at the screen's rows
+        let short = match app.settings.ui_size {
+            0 => rows * need.div_ceil(rows),
+            p => settings::ui_size_rows(p).min((screen_width().min(screen_height()) * screen_dpi_scale()).max(1.0) as u32),
         };
         let (w, h) = (screen_width().max(1.0), screen_height().max(1.0));
         let vrows = if h > w { (short as f32 * h / w).round() as u32 } else { short };