Fix review findings across compositor and shell

crates/ferese-animation/src/settings.rs

@@ -29,14 +29,21 @@ impl MotionSettings {
     }
 
     pub fn validate(self) -> Result<(), String> {
-        if !self.speed.is_finite() || self.speed <= 0.0 {
-            return Err("animation speed must be finite and positive".into());
-        }
+        self.validate_speed()?;
         self.spring_config()?;
         self.viewport_config()?;
         Ok(())
     }
 
+    /// Bound both duration division and elapsed-time multiplication.
+    pub fn validate_speed(self) -> Result<f64, String> {
+        if self.speed.is_finite() && (0.01..=100.0).contains(&self.speed) {
+            Ok(self.speed)
+        } else {
+            Err("animation speed must be between 0.01 and 100 (inclusive)".into())
+        }
+    }
+
     pub fn spring_config(self) -> Result<SpringConfig, String> {
         self.spring.resolve(240.0)
     }
@@ -108,6 +115,28 @@ impl SpringSettings {
 mod tests {
     use super::*;
 
+    #[test]
+    fn speed_validation_rejects_extremes_and_accepts_safe_boundaries() {
+        for speed in [f64::NAN, f64::INFINITY, 0.0, -1.0, 1e-100, 1e100, 0.009, 101.0] {
+            let settings = MotionSettings {
+                speed,
+                ..Default::default()
+            };
+            assert!(settings.validate_speed().is_err());
+            assert!(settings.validate().is_err());
+        }
+        for speed in [0.01, 0.5, 1.0, 100.0] {
+            let settings = MotionSettings {
+                speed,
+                ..Default::default()
+            };
+            assert_eq!(settings.validate_speed().unwrap(), speed);
+            assert!(settings.validate().is_ok());
+            assert!(!settings.duration(120.0).is_zero());
+            assert!(!std::time::Duration::from_secs(60).mul_f64(speed).is_zero());
+        }
+    }
+
     #[test]
     fn defaults_are_critical_with_distinct_spatial_and_viewport_responses() {
         let settings = MotionSettings::default();

crates/ferese-core/src/workspace.rs

@@ -10,7 +10,7 @@ use ferese_layout::{
 #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub struct WorkspaceId(pub u64);
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct Workspace {
     pub id: WorkspaceId,
     pub layout: WorkspaceLayout,
@@ -382,7 +382,7 @@ impl From<LayoutError> for WorkspaceError {
     }
 }
 
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct WorkspaceSet {
     active: WorkspaceId,
     workspaces: HashMap<WorkspaceId, Workspace>,