feat: per-slider band-style override — cce-bevel adopts it

Slider::with_band forces the band style (thin full-range band swelling
at the value) on or off per widget, where before only the DE-wide
style.control.slider.style config chose it. cce-bevel opts all eight
knobs in.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/bin/cce-bevel.rs       | 12 +++++++++---
 src/widget/input/slider.rs | 14 +++++++++++++-
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/bin/cce-bevel.rs b/src/bin/cce-bevel.rs
index 4e255d4..7b4070a 100644
--- a/src/bin/cce-bevel.rs
+++ b/src/bin/cce-bevel.rs
@@ -60,7 +60,11 @@ impl ProfileKnobs {
     fn new(seed: Option<(f32, f32, f32)>) -> Self {
         let (s, b, c) = seed.unwrap_or((0.5, 0.5, 0.5));
         let knob = |v: f32, label: &str| {
-            Slider::new().with_label(label).with_value(v.clamp(0.0, 1.0)).with_scroll(true)
+            Slider::new()
+                .with_label(label)
+                .with_value(v.clamp(0.0, 1.0))
+                .with_scroll(true)
+                .with_band(true)
         };
         let mut this = Self {
             shoulder: knob(s, "Shoulder"),
@@ -408,14 +412,16 @@ impl Application for BevelPopup {
                 .with_value(((depth - dmin) / (dmax - dmin)).clamp(0.0, 1.0))
                 .with_readout(true)
                 .with_decimals(2)
-                .with_scroll(true),
+                .with_scroll(true)
+                .with_band(true),
             width_slider: Slider::new()
                 .with_label("Width")
                 .with_range(wmin, wmax)
                 .with_value(((width - wmin) / (wmax - wmin)).clamp(0.0, 1.0))
                 .with_readout(true)
                 .with_decimals(1)
-                .with_scroll(true),
+                .with_scroll(true)
+                .with_band(true),
             save_button: Button::new(0.0, 0.0, 0.0, 0.0).with_label("Save"),
             reset_button: Button::new(0.0, 0.0, 0.0, 0.0).with_label("Reset"),
             status: "Edits apply live; Save writes config.kdl.".to_string(),
diff --git a/src/widget/input/slider.rs b/src/widget/input/slider.rs
index 8fb2250..a7b8319 100644
--- a/src/widget/input/slider.rs
+++ b/src/widget/input/slider.rs
@@ -61,6 +61,9 @@ pub struct Slider {
     last_wheel: Option<std::time::Instant>,
     /// Readout / edit-buffer display precision (decimal places).
     decimals: usize,
+    /// Per-widget band-style override; `None` follows the DE config
+    /// (`style.control.slider.style`).
+    band_override: Option<bool>,
 }
 
 impl Slider {
@@ -82,6 +85,7 @@ impl Slider {
             scroll_vel: 0.0,
             last_wheel: None,
             decimals: 2,
+            band_override: None,
         })
     }
 
@@ -127,7 +131,7 @@ impl Slider {
     /// full-range band that inflates smoothly at the value — no track fill, no
     /// thumb ball, no carve.
     fn band(&self) -> bool {
-        crate::layout::slider_band()
+        self.band_override.unwrap_or_else(crate::layout::slider_band)
     }
 
     /// The width the value maps over: the full track under the band style
@@ -397,6 +401,14 @@ impl Adapted<Slider> {
         self.decimals = decimals;
         self
     }
+
+    /// Force the band style (the thin full-range band swelling at the value)
+    /// on or off for this slider, regardless of the DE-wide
+    /// `style.control.slider.style` setting.
+    pub fn with_band(mut self, band: bool) -> Self {
+        self.band_override = Some(band);
+        self
+    }
 }
 
 impl Layout for Slider {