stacklok / toolhive-studio / 25808404938 / 1

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feat(playground): edit/resend a previous user message (#2241)

* feat(playground): edit/resend a previous user message

Adds an Edit button to the per-message actions slot (user messages
only). Clicking it pre-fills the composer with the message text and
focuses the textarea with the cursor at the end. The user can then
tweak and submit normally — the edited text is sent as a new message;
history is not rewritten.

Plumbing: a small ChatComposerContext exposes setDraftText and
focusComposer from ChatInputPrompt up to the message rows.

* feat(playground): rewind-and-retry when editing the streaming message

When the user clicks Edit on the last user message while the assistant
is currently streaming a response, the submit button switches to a
Resend action. Clicking it cancels the active stream, drops the partial
assistant response and the original user message, and sends the new
text as a fresh message — replacing the in-flight turn with the edited
one. A small chip above the composer surfaces the mode and offers a
cancel.

Persists the trimmed messages via the existing
`chat:update-thread-messages` IPC handler so a navigation mid-stop
can't resurrect the partial state.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(playground): catch async rejection on the normal send path

Address PR review: the normal-send path wrapped `onSendMessage` in a
synchronous try/catch, but the callee returns a Promise. Async
rejections escaped as unhandled, and `onClearEdit()` + `setText('')`
ran unconditionally — so a failed send still cleared the composer,
leaving the user with no way to retry. Mirror the rewind path's
`Promise.resolve(...).catch(...)` pattern and restore the text on
rejection. Regression test added.

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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