feat: handle mid-stream LLM resets and deduplicate UI action stream events

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- Backend (LLM Gateway):
  - Record structured 'llm_stream_reset' event with discard action, failure reason, and retry messaging on mid-stream generation errors.
  - Add unit test verifying stream reset event payload on mid-stream errors.

- Frontend (Showcase UI):
  - Handle 'llm_stream_reset' events in agent service and stream aggregator, discarding interrupted chunks while showing retry indicators.
  - Establish a single source of truth for tool and action events in the timeline to eliminate duplicated action rows while retaining ADB and explorer tools.
  - Add @angular/cdk dependency and update agent stream component styling and layout.
  - Add unit tests for stream aggregation and tool display filtering.

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somew1nd committed 2026-09-03 14:38:02 -07:00

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apps/showcase_ui/src/app/components/agent-stream/agent-stream.component.scss

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