shinygenui 0.1.0

New features

• Use genui_component() to define a component and genui_catalog() to collect components into a catalog. Each component becomes an ellmer tool with validated arguments.
• Use genui_canvas() and genui_server() to let the model add components to a running app. The included tools let it update or remove a component, clear the canvas, and inspect the current canvas.
• Every call from the model passes through genui_dispatch() before it can change the canvas. If a call fails, the model receives the error and the Shiny session keeps running.
• genui_components_bslib() provides a value box, Markdown card, data table, scatter plot, and histogram with a slider for the number of bins. genui_card_row() provides a container for arranging these components.
• genui_trace() records each successful call. genui_replay() can rebuild the canvas from that record without an LLM.