fix(render): suspense tests

[gabrielmfern]

Summary by cubic

Stabilized Suspense rendering tests by replacing external fetches with a controlled promise and updating snapshots. This removes network dependency, reduces flakiness, and verifies multibyte content rendering.

• Bug Fixes
  • Replaced fetch with a 500ms Promise returning HTML.
  • Updated inline snapshots and linted specs in browser and node tests to match final Suspense output.
  • Ensures tests reliably wait for Suspense to resolve before asserting.

^{Written for commit 3332563. Summary will update on new commits.}

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Latest commit: 3332563

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Feb 18, 2026 2:37pm
react-email-demo	Ready	Preview, Comment	Feb 18, 2026 2:37pm

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commit: 3332563