test: add homepage performance benchmark

[onmax]

Adds a repeatable production homepage benchmark. This PR exists to establish the main baseline for the #433 comparisson

Baseline

Medians from three production Chromium runs on an Apple M4:

Metric	Desktop	Slow phone (6x CPU)
LCP	64 ms	240 ms
Frame gap p50	8.3 ms	8.3 ms
Frame gap p95	9.2 ms	9.2 ms
Frame gap p99	9.3 ms	9.7 ms
Total long-task time	52 ms	661 ms
JS heap growth	10.72 MiB	10.35 MiB
DOM nodes	2,722	2,721
Event listeners	939	939
Transfer size	9.17 MB	9.14 MB

The benchmark uses Vitest 5 and the preview packages from nuxt/test-utils#1802

[vercel]

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	vitest@​4.1.11 ⏵ 5.0.0	+1		+1

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