refactor(clippy): apply all super pedantic lints

Realised that I hadn't turned on super pedantic mode for clippy in the
komorebi-core and komorebic crates. This commit ensures the same clippy
config across all crates and applies the lint suggestions that arose as
a result of turning on the same config everywhere.

komorebi-core/src/cycle_direction.rs

@@ -12,7 +12,8 @@ pub enum CycleDirection {
 }
 
 impl CycleDirection {
-    pub fn next_idx(&self, idx: usize, len: usize) -> usize {
+    #[must_use]
+    pub const fn next_idx(&self, idx: usize, len: usize) -> usize {
         match self {
             CycleDirection::Previous => {
                 if idx == 0 {