fix: perbaiki 5 warning clippy pre-existing (base untuk TUI overhaul)

unnested_or_patterns, collapsible_if, items_after_statements, dan
case_sensitive_file_extension_comparisons di auto.rs, engine.rs, dan
actions/mod.rs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/subagent/auto.rs

@@ -109,17 +109,21 @@ fn is_production_code(path: &str) -> bool {
         matches!(
             c,
             std::path::Component::Normal(seg)
-                if matches!(seg.to_str(), Some("test") | Some("tests") | Some("__tests__"))
+                if matches!(seg.to_str(), Some("test" | "tests" | "__tests__"))
         )
     });
 
     let file_stem = path_obj.file_stem().and_then(|s| s.to_str()).unwrap_or("");
     let is_test_filename = file_stem.starts_with("test_")
         || file_stem.ends_with("_test")
-        || file_stem.ends_with(".test")
+        || std::path::Path::new(file_stem)
+            .extension()
+            .is_some_and(|ext| ext.eq_ignore_ascii_case("test"))
         || file_stem == "spec"
         || file_stem.ends_with("_spec")
-        || file_stem.ends_with(".spec");
+        || std::path::Path::new(file_stem)
+            .extension()
+            .is_some_and(|ext| ext.eq_ignore_ascii_case("spec"));
 
     if in_test_dir || is_test_filename {
         return false;