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Fusion Agent 9d8c14b4e8 FN-165: use session context usage for chat indicator

Use provider-reported pi session context usage to drive the Chat context indicator.

- Track measured and pending session context usage in the dashboard.
- Expose bounded context metadata from chat sessions and update token estimation.
- Add regression coverage, localized labels, documentation, and a changeset.

Files changed:
 .changeset/fn-165-chat-context-usage.md            |  7 ++
 docs/dashboard-guide.md                            |  4 +-
 packages/dashboard/app/components/ChatView.tsx     | 49 ++++++++----
 .../__tests__/ChatView.context-window.test.tsx     | 84 +++++++++++++++++++-
 .../app/utils/__tests__/chatContextUsage.test.ts   | 66 ++++++++++++++++
 .../app/utils/__tests__/estimateChatTokens.test.ts | 10 +++
 packages/dashboard/app/utils/chatContextUsage.ts   | 73 ++++++++++++++++++
 packages/dashboard/app/utils/estimateChatTokens.ts | 39 ++++++++--
 .../dashboard/src/__tests__/chat-manager.test.ts   | 89 +++++++++++++++++++++
 packages/dashboard/src/chat.ts                     | 65 +++++++++++++---
 packages/i18n/locales/en/app.json                  |  3 +
 packages/i18n/locales/es/app.json                  |  3 +
 packages/i18n/locales/fr/app.json                  |  3 +
 packages/i18n/locales/ko/app.json                  |  3 +
 packages/i18n/locales/pt-BR/app.json               |  3 +
 packages/i18n/locales/zh-CN/app.json               |  3 +
 packages/i18n/locales/zh-TW/app.json               |  3 +
 packages/i18n/src/resources.d.ts                   | 19 +++--
 18 files changed, 483 insertions(+), 43 deletions(-)

Fusion-Task-Id: FN-165

Fusion-Task-Lineage: a95a9c7f-80aa-41be-8807-1fbd383f0f1d

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

2026-08-23 01:37:58 +00:00