* fix(ui): show pasted image previews in input and transcript
The half-block thumbnail preview added in #47 rendered but was clipped
off the bottom of the screen, and submitted images showed only a text
badge in the conversation history.
- Mark the layout dirty when clipboardImageMsg / thumbnailReadyMsg reach
the parent, so distributeHeight re-measures the now-taller input region
instead of keeping a stale height that pushed the preview off-screen
- Render thumbnail previews in the transcript after a user message,
appended as a verbatim ScrollList item (raw ANSI half-blocks would be
mangled if folded into the word-wrapped user text block)
- Render transcript previews asynchronously via a tea.Cmd so decode +
resample never blocks the Bubble Tea event loop
- Add regression tests covering the input layout recompute and the
transcript preview flow
* fix(ui): anchor transcript image preview to its user message
- Insert the async thumbnail preview directly after the originating user
message (tracked via anchorID) instead of appending, so a streamed
assistant reply that lands first no longer pushes the preview out of place
- Make the layout regression test deterministic by forcing a truecolor
profile, avoiding flakes on low-color CI terminals where the thumbnail
would render empty
- Add tests for anchored insertion and the unknown-anchor append fallback
Ed Zynda