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Fusion Agent e67403cd6a FN-155: add expandable thinking traces to transcripts

Add a reusable expandable thinking trace across chat and agent transcript surfaces.

- Add the ThinkingTrace component, styling, localized labels, and documentation.
- Render trace sections across chat, planning, mission, milestone, workflow, and agent log views.
- Preserve streaming trace data and add regression and surface coverage.

Files changed:
 .changeset/fn-155-thinking-trace.md                |   7 ++
 docs/dashboard-guide.md                            |   4 +
 .../dashboard/app/components/AgentLogViewer.tsx    |  11 +-
 packages/dashboard/app/components/ChatView.css     |  10 +-
 .../app/components/ConversationHistory.tsx         |   3 +-
 .../components/MilestoneSliceInterviewModal.tsx    |   3 +-
 .../app/components/MissionInterviewModal.tsx       |   3 +-
 .../dashboard/app/components/PlanningModeModal.tsx |   9 +-
 .../app/components/StandardChatSurface.tsx         |  21 ++--
 packages/dashboard/app/components/TaskChatTab.tsx  |  17 +--
 .../dashboard/app/components/ThinkingTrace.css     |   7 ++
 .../dashboard/app/components/ThinkingTrace.tsx     |  99 ++++++++++++++++++
 .../app/components/WorkflowResultsTab.tsx          |   4 +
 .../__tests__/ChatView.core-interactions.test.tsx  |  25 +++++
 .../MilestoneSliceInterviewModal.test.tsx          |  15 ++-
 .../__tests__/MissionInterviewModal.test.tsx       |  15 ++-
 .../PlanningModeModal.planning-flow.test.tsx       |  33 +++++-
 .../app/components/__tests__/TaskChatTab.test.tsx  |  16 +++
 .../__tests__/ThinkingTrace.surfaces.test.tsx      |  70 +++++++++++++
 .../components/__tests__/ThinkingTrace.test.tsx    | 115 +++++++++++++++++++++
 .../dashboard/src/__tests__/chat-manager.test.ts   |  11 ++
 packages/engine/src/__tests__/agent-logger.test.ts |  15 +++
 packages/engine/src/__tests__/streaming-delta.test.ts   |  13 +++
 packages/engine/src/execution/streaming-delta.ts   |   4 +
 packages/i18n/locales/en/app.json                  |   8 ++
 packages/i18n/locales/es/app.json                  |   8 ++
 packages/i18n/locales/fr/app.json                  |   8 ++
 packages/i18n/locales/ko/app.json                  |   8 ++
 packages/i18n/locales/pt-BR/app.json               |   8 ++
 packages/i18n/locales/zh-CN/app.json               |   8 ++
 packages/i18n/locales/zh-TW/app.json               |   8 ++
 packages/i18n/src/resources.d.ts                   |   8 ++
 32 files changed, 539 insertions(+), 55 deletions(-)

Fusion-Task-Id: FN-155

Fusion-Task-Lineage: 2aafff54-2146-4480-874b-393dc991d52b

Co-authored-by: Fusion <noreply@runfusion.ai>

2026-08-23 01:36:13 +00:00