chore: prepare v0.4.0 release

Author: Dev-Beom

CHANGELOG.md

@@ -1,3 +1,24 @@
+## 0.4.0
+
+- Added custom style authoring APIs:
+  - `JsonStyleDefinition.fromJson()`
+  - `JsonStyleDefinition.toJson()`
+  - `JsonStyleDefinition.merge()`
+  - `JsonCatalog.withStyle()`
+  - `JsonCatalog.withStyles()`
+  - `JsonCatalog.withStylesFromJson()`
+- Added style token support to prompt generation for richer LLM guidance.
+- Expanded showcase app:
+  - Runtime custom style creation dialog (`Add Custom Style`)
+  - Startup custom style injection via `CUSTOM_STYLE_JSON`
+  - Auto stream/capture runtime flags for demo recording
+  - New streamed multi-component scenario (`component_stream`)
+- Added custom style guide documentation:
+  - `docs/custom-style-guide.md`
+- Added component-stream GIF demo:
+  - `assets/gifs/component-stream-render.gif`
+- Updated README with custom style usage and streaming GIF examples.
+
 ## 0.3.0
 
 - Added style preset model with `JsonStyleDefinition` and `JsonCatalog.styles`

README.md

@@ -203,7 +203,7 @@ final catalog = baseCatalog.withStylesFromJson({
 ```
 
 See full style authoring guide:
-- [`docs/custom-style-guide.md`](docs/custom-style-guide.md)
+- [`doc/custom-style-guide.md`](doc/custom-style-guide.md)
 
 ## Stream JSONL Patches
 

docs/custom-style-guide.md doc/custom-style-guide.mddocs/custom-style-guide.md renamed to doc/custom-style-guide.md

@@ -68,7 +68,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.3.0"
+    version: "0.4.0"
   flutter_lints:
     dependency: "direct dev"
     description:

example/pubspec.lock

@@ -1,6 +1,6 @@
 name: flutter_json_render
 description: "Guardrailed JSON-to-Widget renderer for Flutter and Dart."
-version: 0.3.0
+version: 0.4.0
 homepage: "https://github.com/Dev-Beom/flutter-json-render"
 repository: "https://github.com/Dev-Beom/flutter-json-render"
 issue_tracker: "https://github.com/Dev-Beom/flutter-json-render/issues"