Fix selector updater render loop

[cursor]

Changes

• Memoized useHandleSelectorComponent's imperative updater so effects that depend on it do not re-run after the updater's own local state change.
• Added a focused regression test covering the stable-updater behavior.
• Updated TemplateSidebar to include the now-stable updater in its effect dependencies.

Testing Criteria

• yarn test src/hooks/useHandleSelectorComponent.test.tsx --runInBand passes and verifies an effect keyed on updateRenderingItem runs once after calling the updater.
• yarn lint:check passes with existing repository warnings.
• yarn prettier:check src/hooks/useHandleSelectorComponent.tsx src/hooks/useHandleSelectorComponent.test.tsx src/app/configure-tasks-app/ui/TemplateSidebar.tsx passes.
• Manual browser smoke with yarn dev: root and detail routes are reachable but token-gated locally; no valid Copilot token was available to reach the live task detail/sidebar UI.

Notes

• yarn tsc still fails on the known pre-existing SVG module declaration errors in src/icons/index.ts; no TypeScript errors referenced the touched files.
• Full yarn test --runInBand runs 17 suites successfully, then fails to load src/app/api/tests/utils/authenticate.test.ts because Jest cannot parse ESM-only p-retry from node_modules; this is outside the selector change.
• Linear and Sentry MCP direct reads were unavailable (Linear returned 401, Sentry requires auth), so source confirmation is based on trigger metadata and the Tasks app Sentry configuration.

Impact & Surface Area of Change

• Affects task/template workflow-state selector state synchronization through useHandleSelectorComponent.
• Main regression surface: status selector rendering and local optimistic selector updates in task cards, task detail sidebar, template cards, and template sidebar.

  

[linear-code]

OUT-3962

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tasks-app	Ready	Preview, Comment	Jul 8, 2026 7:24pm