Vance Ingalls 323ff8f860 fix: resolve oxlint errors across codebase (#24) ...

## Summary
- Remove 5 unused `beforeEach` imports from test files
- Remove unused imports (`existsSync`, `TimelineCompositionElement`)
- Remove unused destructured variables (`options`, `width`, `height`, `goldenEl`)
- Remove dead `formatDuration` function
- Fix unused catch parameters (`catch (err)` → `catch`)
- Prefix unused `renderError` state with `_`
- Add `eslint-disable-next-line` for 2 React exhaustive-deps false positives (stable ref + zustand setter)

Part 2/4 of [VA-851](https://linear.app/heygen/issue/VA-851/pre-migration-configure-eslint-prettier-and-conventional-commits)

## Test plan
- [x] `pnpm lint` — 0 errors on 193 files
- [x] All 348 tests pass (core + engine)

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..

adapters

initial code (#2)

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compiler

initial code (#2)

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generators

fix: resolve oxlint errors across codebase (#24)

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inline-scripts

initial code (#2)

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lint

initial code (#2)

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parsers

initial code (#2)

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runtime

fix: resolve oxlint errors across codebase (#24)

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templates

initial code (#2)

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core.types.ts

initial code (#2)

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index.test.ts

initial code (#2)

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index.ts

initial code (#2)

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