fix: resolve rustfmt formatting and clippy warnings

- Apply cargo fmt across schema.rs, session_usage*.rs, skill.rs, usage_stats.rs
- Fix clippy::for_kv_map: use messages.values() instead of (_, msg) pattern
- Suppress clippy::only_used_in_recursion for intentional recursive base path
- Fix prettier formatting in UsageScriptModal.tsx

src/components/UsageScriptModal.tsx

@@ -1066,7 +1066,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                       ...script,
                       timeout:
                         e.target.value === ""
-                          ? (("" as unknown) as number)
+                          ? ("" as unknown as number)
                           : Number(e.target.value),
                     })
                   }
@@ -1098,7 +1098,7 @@ const UsageScriptModal: React.FC<UsageScriptModalProps> = ({
                       ...script,
                       autoQueryInterval:
                         e.target.value === ""
-                          ? (("" as unknown) as number)
+                          ? ("" as unknown as number)
                           : Number(e.target.value),
                     })
                   }