refactor: extract a generic useStorageValue hook for localStorage state

[cleanjunc]

Summary

Adds src/lib/use-storage-value.ts, a generic hook that encapsulates the localStorage read, write, parse, serialize, and cross tab event subscription pattern that was previously duplicated across three files. useTrackedRepos, useTrackedMiners, and useSettings are now thin wrappers around it.

The public hook APIs and the custom event names (tracked-repos-changed, tracked-miners-changed, settings-changed) are unchanged, so no call sites needed to be touched. The wrappers preserve the original behavior of always reflecting the parsed disk value after a write (toggle and update still re read from localStorage so rapid successive writes do not race).

Related Issues

Closes #162

Type of Change

• Bug fix
• New feature
• Enhancement
• Refactor
• Documentation
• Other (describe):

Testing

• pnpm build passes
• Manual browser smoke test: toggled repo tracking on the Repositories page, toggled miner tracking on the Miners page, and changed several Settings values (layout, page size, render markdown) with two tabs open to confirm same tab and cross tab updates still propagate
• N/A, docs / config only

Checklist

• Self-reviewed the diff
• Follows existing code patterns and naming
• No unrelated changes included
• Documentation updated if behavior changed

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b9122877-89a7-4994-9748-e74d12cbc7b6

📥 Commits

Reviewing files that changed from the base of the PR and between aab5b71 and 13d7ff0.

📒 Files selected for processing (4)

• src/lib/settings.ts
• src/lib/tracked-miners.ts
• src/lib/tracked-repos.ts
• src/lib/use-storage-value.ts

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🧪 Generate unit tests (beta)

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