test: add JavaScript fixture and update comment pattern tests

tests/basic/test_watch.py

@@ -6,14 +6,17 @@ from aider.watch import FileWatcher
 def test_ai_comment_pattern():
     # Test various AI comment patterns
     test_comments = [
+        # Python style
         "# ai do something",
         "# AI make this better",
         "# ai! urgent change needed",
         "# AI! another urgent one",
-        "//ai javascript style",
-        "//AI do that thing",
-        "//ai! urgent js thing",
-        "// ai with some space",
+        # JavaScript style
+        "//ai do something",
+        "//AI make this better", 
+        "//ai! urgent change needed",
+        "//AI! another urgent one",
+        "// ai with space",
         "// AI with caps",
         "// ai! with bang",
     ]

tests/fixtures/watch.js

@@ -0,0 +1,27 @@
+// Regular AI comment
+//ai do something
+//AI make this better
+//ai! urgent change needed
+//AI! another urgent one
+// ai with space
+// AI with caps
+// ai! with bang
+// this is not an ai comment
+// aider is not an ai comment
+
+function dummyFunction() {
+    // ai inside function
+    return true;
+}
+
+class Example {
+    constructor() {
+        // ai in constructor
+        this.value = 42;
+    }
+
+    method() {
+        // ai in method
+        return this.value;
+    }
+}