Cover normalize_path_key's leading-dot folding arm

Path::components() normalizes inner '.' away on its own and only yields Component::CurDir for a LEADING '.', so the folding loop's CurDir arm is reachable only while the joined path stays relative. The previous case joined against an absolute cwd and therefore never reached it.

Author: devfive

crates/vespera_macro/src/file_utils.rs

@@ -490,6 +490,14 @@ mod tests {
             absolute.ends_with("/work/project/b.rs"),
             "an absolute path must not be re-rooted at cwd: {absolute}"
         );
+
+        // `Path::components()` normalizes inner `.` away by itself and only ever
+        // yields `Component::CurDir` for a LEADING `.`, so the folding loop's
+        // `CurDir` arm is reachable only when the joined path stays relative.
+        assert_eq!(
+            normalize_path_key("./routes/./users.rs", Path::new(".")),
+            "routes/users.rs"
+        );
     }
 
     #[test]