fix: search worker INIT timeout and runtime failure fallback

[Just-Insane]

Description

Fixes #256

Fail search worker startup fast when IndexedDB open never settles, preserve a clean worker ERROR path for INIT failures, and turn empty runtime worker errors into concrete failure messages. This keeps search from hanging indefinitely and resets pending search/backfill state when the worker fails.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

AI disclosure:

• Partially AI assisted (clarify which code was AI assisted and briefly explain what it does).
• Fully AI generated (explain what all the generated code does in moderate detail).
  AI assistance was used to reapply the scoped fix in a fresh worktree and verify it. The code adds a small search-worker lifecycle helper that wraps IndexedDB open with a timeout, keeps blocked opens waiting until they either succeed or time out, normalizes worker INIT/runtime failure messages, and ensures the main thread tears down pending backfill/query state when the worker fails.

Validation

• pnpm lint
• pnpm fmt:check
• pnpm typecheck
• pnpm test:run
• pnpm knip
• pnpm build

[github-actions]

Sentry Preview Error Triage

No Sentry errors found for this PR's preview deployment as of Mon, 22 Jun 2026 14:52 UTC.

This comment updates automatically after each push.

[github-code-quality]

Code Coverage Overview

Languages: JavaScript

JavaScript / code-coverage/vitest

The overall coverage in the codex/issue-256-sear... branch remains at 26%, unchanged from the integration branch.

Show a code coverage summary of the most impacted files.

File	integration 66ef3dd	codex/issue-256-sear... 80b3383	+/-
src/app/plugins...kerLifecycle.ts	0%	93%	+93%

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_{Updated June 22, 2026 14:55 UTC
Code Coverage is in Public Preview. Learn more and provide us with your feedback.}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: f9f293424e

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[github-actions]

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Status	Preview URL	Commit	Alias	Updated (UTC)
✅ Deployment successful!	https://pr-273-charm.justin-tech.workers.dev	e1a7ed0	pr-273	Mon, 22 Jun 2026 14:53:54 GMT