Flutter chat widgets (AIChatView / AIChatController)

[Amayyas]

Why

Turn the package from an API client into a real Flutter SDK: drop-in chat UI.

Estimated effort: 3-5 days. The biggest chantier on the roadmap — involves a structuring decision.

Recommended decision

Ship a separate package flutter_ai_sdk_ui (same repo as a workspace/monorepo, or a distinct repo) so people who only want the API client don't pull in a material dependency. The main package currently has zero material import — keep it that way.

Minimal viable content

• AIChatController (a ChangeNotifier wrapping FlutterAI: messages, isGenerating state, errors, abort).
• AIChatView: message ListView + input field + token-by-token streaming display (listen to streamChat, rebuild per chunk), typing indicator, error handling with retry.
• Themable MessageBubble (via a ThemeExtension), basic markdown support (evaluate markdown_widget vs flutter_markdown).
• A full example in example/.

Infra if a separate package

• Its own pubspec.yaml, CI (matrix job), pub.dev publishing — reuse the
  tag → OIDC workflow with a tag pattern like ui-v{{version}} and its own
  pub.dev admin configuration.

Definition of done

• Decide: separate package vs. same package under a new export
• AIChatController + AIChatView + themable message bubble
• Streaming rendering, error/retry handling
• Full example app
• If separate package: CI + publish workflow mirroring the main package