Use standard parity and saturating generation operations

crates/oa-desktop/src/behavior/topology/removal_input.rs

@@ -15,7 +15,7 @@ impl Lifetime {
     /// Even generations are idle; odd generations belong to one live gesture.
     pub(super) fn idle(&self) -> Option<u64> {
         let generation = self.0.load(Ordering::SeqCst);
-        (generation % 2 == 0).then_some(generation)
+        generation.is_multiple_of(2).then_some(generation)
     }
 
     /// Retire an idle packet at a native input boundary (including the
@@ -23,7 +23,7 @@ impl Lifetime {
     pub(super) fn revoke_idle(&self) {
         if let Some(generation) = self.idle() {
             // Keep overflow terminal and unavailable rather than reusing zero.
-            let next = generation.checked_add(2).unwrap_or(u64::MAX);
+            let next = generation.saturating_add(2);
             let _ = self
                 .0
                 .compare_exchange(generation, next, Ordering::SeqCst, Ordering::SeqCst);