fix(accounts): handle empty account comment lookups

[tomcasaburi]

Summary

• Guard useAccountComment's commentCid fallback so an empty lookup does not treat undefined === undefined as a matched account mapping.
• Add a regression test for calling useAccountComment() before an account/comment lookup is available.
• Bump the package to 0.1.21 and regenerate the built dist output.

Context

5chan's built smoke test caught this after moving from its local safe wrapper to direct useAccountComment calls: home render crashed before account state loaded because the empty lookup tried to read accountCommentIndex from an undefined mapping.

Verification

• corepack yarn test src/hooks/accounts/accounts.test.ts
• corepack yarn prettier
• corepack yarn type-check
• corepack yarn lint (existing warnings, 0 errors)
• corepack yarn build
• corepack yarn test
• corepack yarn test:coverage
• git diff --check

---

Note

Low Risk
Small guard in comment index resolution plus tests; no auth or data-model changes.

Overview
Fixes a crash when useAccountComment runs before account/comment lookup data exists (e.g. 5chan home render). The commentCid fallback no longer treats a missing store entry as a match via undefined === undefined; it only uses the mapping when commentCidToAccountComment is defined and its accountId matches.

Adds a test that calling useAccountComment() with no index/CID yields initializing and empty errors. Version bumped to 0.1.21 with matching dist output.

^{Reviewed by Cursor Bugbot for commit cf97c11. Bugbot is set up for automated code reviews on this repo. Configure here.}

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b7923449-a0b1-4d6c-abdb-cab141436da5

📥 Commits

Reviewing files that changed from the base of the PR and between d584438 and cf97c11.

⛔ Files ignored due to path filters (2)

• dist/hooks/accounts/accounts.js is excluded by !**/dist/**
• dist/hooks/accounts/accounts.js.map is excluded by !**/dist/**, !**/*.map

📒 Files selected for processing (3)

• package.json
• src/hooks/accounts/accounts.test.ts
• src/hooks/accounts/accounts.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/account-comment-empty-lookup

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