Fix task detail path workspace handling

[cursor]

Changes

• Scope task traversal path raw lookup to the authenticated user's workspace.
• Return not found from subtask count lookup when the task row is absent in the current workspace, while keeping a server error for rows with missing path data.
• Add focused unit coverage for traversal path workspace scoping and subtask-count not-found behavior.

Testing Criteria

• yarn test --runTestsByPath src/app/api/tests/services/tasks.service.test.ts src/app/api/tests/services/subtasks.service.test.ts
• yarn eslint src/app/api/tasks/tasks.service.ts src/app/api/tasks/subtasks.service.ts src/app/api/tests/services/tasks.service.test.ts src/app/api/tests/services/subtasks.service.test.ts (passes with existing repository warnings)
• yarn tsc (blocked by existing SVG module resolution errors in src/icons/index.ts)

Notes

• Linear: OUT-3792
• Sentry: TASKS-8H

Impact & Surface Area of Change

• Task detail page server loaders for traversal breadcrumbs and subtask status.
• Cross-workspace or stale-token detail URLs should now follow the existing not-found/deleted redirect behavior instead of producing an unexpected 500.

  

[linear-code]

OUT-3792

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tasks-app	Ready	Preview, Comment	May 28, 2026 4:04pm