Issue #159: successful delegation responses were rendered as error
banners because extractResponseText() only handled the A2A result
format (body.result.parts[].text) but delegation.go stores
response_body as {text: "...", delegation_id: "..."}. The error
status was set when the HTTP transport failed even though the actual
agent response was received.
Fixes:
1. extractResponseText: check body.text before the result path so
delegation response_body.text is extracted correctly
2. extractResponseText: also check body.response_preview (WS event shape
from DELEGATION_COMPLETE handler)
3. GroupedCommsView: render NormalMessage when status=error but
responseText is populated (delegation succeeded, transport failed)
instead of burying the content in an error banner
Tests: 8 new cases (4 extractResponseText + 2 extractRequestText
regression + 2 render tests). 189 tests pass across 10 files.
Closes#159.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
