Add RBS type signatures and CHANGELOG entry for async component helpers

- Add RBS signatures for AsyncValue, ImmediateAsyncValue, and AsyncRendering
- Add CHANGELOG entry for the async_react_component feature

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: AbanoubGhadban

react_on_rails_pro/CHANGELOG.md

@@ -25,6 +25,7 @@ _Add changes in master not yet tagged._
 
 ### Added
 
+- **Async React Component Rendering**: Added `async_react_component` and `cached_async_react_component` helpers for concurrent component rendering. Multiple components now execute HTTP requests to the Node renderer in parallel instead of sequentially, significantly reducing latency when rendering multiple components in a view. Requires `ReactOnRailsPro::AsyncRendering` concern in controller. [PR 2139](https://github.com/shakacode/react_on_rails/pull/2139) by [AbanoubGhadban](https://github.com/AbanoubGhadban).
 - Added `config.concurrent_component_streaming_buffer_size` configuration option to control the memory buffer size for concurrent component streaming (defaults to 64). This allows fine-tuning of memory usage vs. performance for streaming applications.
 - Added `cached_stream_react_component` helper method, similar to `cached_react_component` but for streamed components.
 - **License Validation System**: Implemented comprehensive JWT-based license validation with offline verification using RSA-256 signatures. License validation occurs at startup in both Ruby and Node.js environments. Supports required fields (`sub`, `iat`, `exp`) and optional fields (`plan`, `organization`, `iss`). FREE evaluation licenses are available for 3 months at [shakacode.com/react-on-rails-pro](https://shakacode.com/react-on-rails-pro). [PR #1857](https://github.com/shakacode/react_on_rails/pull/1857) by [AbanoubGhadban](https://github.com/AbanoubGhadban).

react_on_rails_pro/sig/react_on_rails_pro/async_value.rbs

@@ -0,0 +1,18 @@
+module ReactOnRailsPro
+  class AsyncValue
+    attr_reader component_name: String
+
+    @task: untyped
+    @component_name: String
+
+    def initialize: (component_name: String, task: untyped) -> void
+
+    def value: () -> untyped
+
+    def resolved?: () -> bool
+
+    def to_s: () -> String
+
+    def html_safe: () -> untyped
+  end
+end

react_on_rails_pro/sig/react_on_rails_pro/concerns/async_rendering.rbs

@@ -0,0 +1,15 @@
+module ReactOnRailsPro
+  module AsyncRendering
+    module ClassMethods
+      def enable_async_react_rendering: (**untyped options) -> void
+    end
+
+    @react_on_rails_async_barrier: untyped
+
+    private
+
+    def wrap_in_async_react_context: () { () -> untyped } -> untyped
+
+    def check_for_unresolved_async_components: () -> void
+  end
+end

react_on_rails_pro/sig/react_on_rails_pro/immediate_async_value.rbs

@@ -0,0 +1,15 @@
+module ReactOnRailsPro
+  class ImmediateAsyncValue
+    attr_reader value: untyped
+
+    @value: untyped
+
+    def initialize: (untyped value) -> void
+
+    def resolved?: () -> bool
+
+    def to_s: () -> String
+
+    def html_safe: () -> untyped
+  end
+end