fix(lint): flag videos nested in visual wrappers

[miguel-heygen]

Summary

Wrapped managed videos could pass hyperframes check and then render as solid black because capture only discovers media that are direct children of the host composition root. The media lint now reports any managed <video> nested inside a visual wrapper, including untimed wrappers, before render.

The check uses the parsed HTML parent boundary instead of the previous timed-wrapper heuristic, preserving direct-root videos and avoiding the existing void-element false positive.

Source report: https://heygen.slack.com/archives/C0BGC335AQY/p1783977535307149

Test plan

• bun test packages/lint/src/rules/media.test.ts — 22 passed
• bun run --cwd packages/lint test — 363 passed
• bun run --cwd packages/lint typecheck
• bun run --cwd packages/lint build
• Pre-commit lint, format, fallow, and repository typecheck hooks

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