parser: port alignment and zig fmt whitespace tests

Port tests:
- "alignment in anonymous literal"
- "'zig fmt: (off|on)' can be surrounded by arbitrary whitespace"

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

parser_test.zig

@@ -2145,6 +2145,43 @@ test "zig fmt: anytype type" {
     );
 }
 
+test "zig fmt: alignment in anonymous literal" {
+    try testTransform(
+        \\const a = .{
+        \\    "U",     "L",     "F",
+        \\    "U'",
+        \\    "L'",
+        \\    "F'",
+        \\};
+        \\
+    ,
+        \\const a = .{
+        \\    "U",  "L",  "F",
+        \\    "U'", "L'", "F'",
+        \\};
+        \\
+    );
+}
+
+test "zig fmt: 'zig fmt: (off|on)' can be surrounded by arbitrary whitespace" {
+    try testTransform(
+        \\// Test trailing comma syntax
+        \\//     zig fmt: off
+        \\
+        \\const struct_trailing_comma = struct { x: i32, y: i32, };
+        \\
+        \\//   zig fmt: on
+    ,
+        \\// Test trailing comma syntax
+        \\// zig fmt: off
+        \\
+        \\const struct_trailing_comma = struct { x: i32, y: i32, };
+        \\
+        \\// zig fmt: on
+        \\
+    );
+}
+
 test "zig fmt: line and doc comment following 'zig fmt: off'" {
     try testCanonical(
         \\// zig fmt: off