Annotation Color Scheme Inconsistency

In **IntelliJ → Settings → Editor → Color Scheme → Dart**, the *Annotation* color setting is only applied to **const annotations** (e.g. `@freezed`), but not to **class-based annotations** (e.g. `@Freezed()`).

#### Current Behavior

* `@freezed`

* Highlighted using the `Metadata` color (as expected for annotations).

* `@Freezed()`

* `Freezed` is highlighted as a regular class name.
* Inherits color from `Classes → Class name` instead of the Annotation/Metadata color.

This results in inconsistent highlighting between const and class-based annotations.

#### Expected Behavior

Both forms of annotations:

```dart
@freezed
@Freezed()
```

should use the same **Annotation/Metadata** color setting in the Dart color scheme.

#### Why This Matters

Class-based annotations are very common in Dart (e.g. `@Freezed()`, `@JsonSerializable()`, etc.). Treating them as regular classes instead of annotations makes it harder to visually distinguish annotations from other class usages and reduces consistency in syntax highlighting.

The issue names no implementation files or tests. Start by locating the Dart syntax-highlighting and color-scheme handling for metadata and annotation references, then compare const annotations with class-based annotations such as @Freezed(). Done means both forms use the Annotation/Metadata color setting, with regression coverage for each form.

Written by the indexing model from the issue text.