* feat(webchat): expand truncated assistant messages inline
Replace the per-message Open in canvas button with an inline Show more /
Show less disclosure on truncated assistant messages that fetches full
content via chat.message.get on demand.
* test(webchat): stabilize inline expansion e2e
* fix(ui): satisfy lint and export gates for inline show-more
* test(ui): update shared disclosure selector
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Co-authored-by: Peter Steinberger <steipete@mac-studio-sf2.local>
de0fa7c208
