chore: migrate vitest to v5 beta

[ocavue]

Migrate the test runner from vitest 4.1 to the 5.0 beta.

• Bump vitest and @vitest/* packages to 5.0.0-beta.7.
• Rewrite the benchmark files for the new in-test bench fixture API.
• Patch vitest-browser-react (module-scope beforeEach cleanup) and vitest-browser-commands (iframe data-scale fallback) for v5 compatibility.
• Replace vitest-fail-on-console with an inline setup that works on v5's browser runner.
• Adapt tests to v5 behavior: strict toHaveTextContent (now toMatchTextContent for partial matches) and Playwright click hit-testing on hover-revealed toolbars.

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Project	Deployment	Actions	Updated (UTC)
meowdown	Ready	Preview	Aug 4, 2026 4:35am

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commit: cac4384

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	93.01%	4687 / 5039
🔵	Statements	90.79%	5268 / 5802
🔵	Functions	90.37%	1127 / 1247
🔵	Branches	86.35%	3355 / 3885

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/converters/pm-to-md.bench.ts	0%	0%	0%	0%	15-31
packages/core/src/extensions/inline-mark-plugin.bench.ts	0%	100%	0%	0%	14-36
packages/core/src/extensions/reference-links-transaction.bench.ts	0%	0%	0%	0%	57-212
packages/react/src/testing/index.ts	100%	100%	100%	100%
packages/vitest/src/config.ts	0%	0%	0%	0%	5-85
packages/vitest/src/setup-console.ts	65%	25%	50%	66.66%	23-25, 35-38

Generated in workflow #1712 for commit cac4384 by the Vitest Coverage Report Action