Upgrade to Storybook 9

[lishaduck]

Supersedes #201, #196, #197.

Related: storybookjs/storybook#31901.

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​storybook/​sveltekit@​9.0.0-beta.5 ⏵ 9.0.13	+1		+1	+1
	@​vitest/​coverage-v8@​3.0.9 ⏵ 3.2.4			+1	+1
	@​storybook/​addon-vitest@​9.0.0-beta.5 ⏵ 9.0.13	+12		+1	+1
	@​storybook/​addon-a11y@​9.0.0-beta.5 ⏵ 9.0.13	+1		+1
	@​types/​react@​19.1.2 ⏵ 19.1.8	+1		+1
	@​vitest/​browser@​3.0.9 ⏵ 3.2.4				+1
	@​sveltejs/​kit@​2.20.1 ⏵ 2.22.0		+5	+1	+1
	@​sveltejs/​vite-plugin-svelte@​5.0.3 ⏵ 5.1.0	+1		+1	+1
	@​vitest/​ui@​3.2.4
	chromatic@​11.28.2 ⏵ 13.0.1
	@​storybook/​addon-designs@​10.0.0 ⏵ 10.0.1				+1
	@​chromatic-com/​storybook@​4.0.0-next.5 ⏵ 4.0.1	+1		+2
	@​storybook/​addon-svelte-csf@​5.0.0-next.28 ⏵ 5.0.4	+1		+1	+2
	@​storybook/​addon-docs@​9.0.0-beta.5 ⏵ 9.0.13	+1

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