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gsxdsm d4aa79b66c FN-8598: preserve legacy task cost badges

Restore cost badges for tasks with valid legacy token totals.

- Preserve usage records when optional timestamps and cache-write totals are absent
- Use task creation time to satisfy legacy usage timestamp requirements
- Cover card badge rendering, unpriced mixed usage, and mobile visibility
- Add a patch changeset for the restored badge behavior

Files changed:
 .changeset/fn-8598-cost-badge-fix.md               |   7 +
 .../task-token-usage-serialization.test.ts         |  45 +++++++
 packages/core/src/task-store/serialization.ts      |  16 ++-
 .../__tests__/TaskCard.cost-badge.test.tsx         | 146 +++++++++++++++++++++
 .../app/utils/__tests__/taskTokenCost.test.ts      |  11 ++
 5 files changed, 221 insertions(+), 4 deletions(-)

Fusion-Task-Id: FN-8598

Fusion-Task-Lineage: 83fb4051-8e0f-4ee9-9f00-0e4d5cb8661e

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

2026-07-26 09:06:41 -07:00