retroglyph 0.0.9

retro_color_rgb() and retro_color_rgba() now parse each color with grDevices::col2rgb() and re-format it with grDevices::rgb(), instead of slicing and concatenating the string. magick::image_raster() returns color specifications rather than guaranteed hex, and for a fully transparent pixel it returns the name "transparent", which the old string handling turned into the invalid "transpa" and "transpaff". The 0.0.8 fix addressed this by flattening at the entry point, but several internal steps build images from character matrices and never pass through retro_image_png(), so the error persisted on platforms whose ImageMagick build retains an alpha channel. Fixing the helpers themselves covers every path. Output is unchanged for hex input.
Clarify in retro_image_png() that flattening onto white is what makes a partially transparent source image tractable: the blend a reader sees is the color to digitize, so compositing is not interchangeable with discarding the alpha channel.

retroglyph 0.0.8

retro_image_png() now flattens the source image onto an opaque white background, and retro_agent_class$register() routes every format through it instead of copying PNG files verbatim. magick::image_raster() reports a fully transparent pixel as the color name "transparent" rather than as hex, which retro_color_rgb() truncated to "transpa" and retro_color_rgba() extended to "transpaff", both invalid color names that stopped the pipeline. Removing the alpha channel once at the entry point means no later step encounters a non-hex pixel value.

Collapse tool call cards in retro_app() by default instead of expanding them.
Top-align and left-align the Step 2 greeting in retro_app() instead of centering it vertically.

Fix the cancel button in retro_app(): the chat turn now runs in a shiny::ExtendedTask, so a cancel click can actually reach stream_controller() and stop the stream instead of being processed only after the response already finished. Since the tools now run outside a reactive context, they read state via shiny::isolate().
retro_chat_replay_simulation()$stream_async() now returns a promise instead of the finished text. A finished string is not a stream, so retro_app() rendered the replay as an already-complete message and the stop button never appeared.
Give retro_app() a theme argument for bslib theming, and put a light/dark mode toggle in the top right of the main panel.
Add a preload hint for shinychat’s JS and CSS bundle in retro_app(), so the browser starts fetching it in parallel with other blocking <script> tags instead of only after they finish, and the greeting renders sooner.
Improve the error messages of the quantize and label tools so the model knows when the user forgot to supply a source image.

move to shinychat 0.5.0.

Use a simulated Kaplan-Meier image for examples and tests.
Reduce content returned from tools, especially retro_tool_label(). Mostly this is a workaround to avoid https://github.com/tidyverse/ellmer/issues/1136, but it also somewhat declutters the context window.
Add a type argument to quantiles() ("survival" default, or "incidence") controlling how probabilities is interpreted, default probabilities to descending (c(0.75, 0.5, 0.25)), and always report both survival and incidence columns in the output, sorted chronologically regardless of input order or type.
Add new methods probabilities() and counts() to the agent class.
Add retro_app(), a Shiny app interface for retroglyph.

Make retro_data_path() more robust to poorly classified anti-aliasing debris: before choosing a curve’s rightmost pixel, drop connected components of the target color smaller than 8 times the line width.