Harden client task template server actions

[cursor]

Changes

• Guard client task server actions against non-OK and non-JSON downstream API responses so Next server-action calls complete with structured results instead of opaque client failures.
• Encode attachment sign-url query parameters and make upload handling tolerate missing signed URLs.
• Abort stale template-apply requests and only let the latest request re-enable task creation.
• Handle structured task creation errors in optimistic subtask creation.

Testing Criteria

• Ran yarn lint:check.
• Ran yarn tsc --noEmit; it still fails on pre-existing SVG module declaration errors in src/icons/index.ts, with no change-related TypeScript errors remaining.

Notes

• Triage source: Linear OUT-3749 / Sentry TASKS-87 in the Tasks project.
• Sentry Seer analysis was unavailable due to budget (HTTP 402), so investigation used the Sentry event/breadcrumbs and local code tracing.

Impact & Surface Area of Change

• Client create-task modal template application flow.
• Shared server actions in src/app/(home)/actions.ts used by task creation/update and attachment upload/sign-url flows.
• Optimistic subtask creation error handling.

  

[linear-code]

OUT-3749

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tasks-app	Ready	Preview, Comment	May 17, 2026 5:13pm