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gsxdsm c468c161c2 FN-7141: add chat context token budget indicator

Add a desktop Direct-chat header indicator for estimated tokens used against the active model context window.

- Estimate chat token usage client-side, including streaming text, and format compact counts.
- Render the context-window badge only for non-mobile Direct-chat threads with known model context windows.
- Cover desktop, mobile, floating-narrow, rooms, unknown-context, and streaming surfaces with tests.
- Document the dashboard behavior and add a release changeset.

Files changed:
 .changeset/fn-7141-chat-context-window.md          |   7 +
 docs/dashboard-guide.md                            |   2 +
 packages/dashboard/app/components/ChatView.css     |  22 +++
 packages/dashboard/app/components/ChatView.tsx     |  35 +++-
 .../__tests__/ChatView.context-window.test.tsx     | 193 +++++++++++++++++++++
 .../app/utils/__tests__/estimateChatTokens.test.ts |  34 ++++
 packages/dashboard/app/utils/estimateChatTokens.ts |  29 ++++
 packages/i18n/locales/en/app.json                  |   1 +
 8 files changed, 322 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-7141

Fusion-Task-Lineage: 3ede9af4-b8d6-4da6-996f-cd9277ef49ac

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

2026-06-27 17:22:12 -07:00