feat: add progressbar height KDL configuration support

 src/layout.rs                      | 30 ++++++++++++++++++++++++++++++
 src/widget/display/progress_bar.rs |  4 ++++
 2 files changed, 34 insertions(+)

diff --git a/src/layout.rs b/src/layout.rs
index ca5b5f6..09e018c 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -89,6 +89,7 @@ fn flatten_json_to_flat_props(val: &serde_json::Value, prefix: &str, flat_props:
                 "style.label.font" => "label_font",
                 "style.control.slider.height" => "slider_height",
                 "style.control.slider.corner_radius" => "slider_corner_radius",
+                "style.control.progressbar.height" => "progressbar_height",
                 "style.control.scrollbar.width" => "scrollbar_width",
                 "style.control.spinbox.height" => "spinbox_height",
                 "style.control.spinbox.button_padding" => "spinbox_button_padding",
@@ -235,6 +236,7 @@ static COLOR_SELECTOR_HEIGHT: RwLock<f32> = RwLock::new(22.0);
 static TEXTBOX_HEIGHT: RwLock<f32> = RwLock::new(44.0);
 static FONT_SELECTOR_HEIGHT: RwLock<f32> = RwLock::new(44.0);
 static SLIDER_HEIGHT: RwLock<f32> = RwLock::new(28.0);
+static PROGRESSBAR_HEIGHT: RwLock<f32> = RwLock::new(24.0);
 static TOGGLE_HEIGHT: RwLock<f32> = RwLock::new(44.0);
 static COLOR_SELECTOR_FONT: RwLock<String> = RwLock::new(String::new());
 static COLOR_SELECTOR_PREVIEW_CORNER_RADIUS: RwLock<f32> = RwLock::new(4.0);
@@ -3386,6 +3388,34 @@ pub fn set_slider_height(height: f32) {
     }
 }
 
+pub fn progressbar_height() -> f32 {
+    use std::sync::Once;
+    static INIT: Once = Once::new();
+    INIT.call_once(|| {
+        if let Some(content) = read_config() {
+            for line in content.lines() {
+                let trimmed = line.trim();
+                if let Some(rest) = trimmed.strip_prefix("progressbar_height") {
+                    let rest = rest.trim_start_matches(|c: char| c == ' ' || c == '=' || c == '"');
+                    let val_str = rest.trim_end_matches('"').trim();
+                    if let Ok(val) = val_str.parse::<f32>() {
+                        if let Ok(mut lock) = PROGRESSBAR_HEIGHT.write() {
+                            *lock = val;
+                        }
+                    }
+                }
+            }
+        }
+    });
+    *PROGRESSBAR_HEIGHT.read().unwrap()
+}
+
+pub fn set_progressbar_height(height: f32) {
+    if let Ok(mut lock) = PROGRESSBAR_HEIGHT.write() {
+        *lock = height;
+    }
+}
+
 
 pub trait RenderTarget {
     fn rect(&mut self, color: [f32; 4], x: f32, y: f32, w: f32, h: f32);
diff --git a/src/widget/display/progress_bar.rs b/src/widget/display/progress_bar.rs
index 62331d5..1337de2 100644
--- a/src/widget/display/progress_bar.rs
+++ b/src/widget/display/progress_bar.rs
@@ -30,6 +30,10 @@ impl Element for ProgressBar {
         self.base.h = h + self.base.label_offset();
     }
 
+    fn preferred_height(&self) -> Option<f32> {
+        Some(crate::layout::progressbar_height())
+    }
+
     fn highlight_quad(&self, _ctx: &UiContext) -> Option<(f32, f32, f32, f32, [f32; 4])>{ None }
 
     fn color(&self) -> [f32; 4] { colors::progress_bg() }