feat: Upgrade shadcn-svelte to latest, upgrade Tailwind to v4

[elliott-with-the-longest-name-on-github]

what it says on the tin pretty much

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
ai-chatbot-svelte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 6, 2025 1:56am

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	typescript-eslint@​8.24.0 ⏵ 8.33.1			-2
	@​tailwindcss/​vite@​4.1.8
	tailwind-variants@​0.3.1 ⏵ 1.0.0	+1		+1
	tailwindcss@​3.4.17 ⏵ 4.1.8	+3		-1
	globals@​15.15.0 ⏵ 16.2.0	+1		+1
	tailwind-merge@​3.0.1 ⏵ 3.3.0	+1		+1
	svelte@​5.20.2 ⏵ 5.33.14				+1
	@​eslint/​compat@​1.2.6 ⏵ 1.2.9				-1
	@​eslint/​js@​9.20.0 ⏵ 9.28.0			+4
	bits-ui@​1.3.4 ⏵ 2.4.1			+5		+31
	mode-watcher@​0.5.1 ⏵ 1.0.7			+1
	svelte-sonner@​0.3.28 ⏵ 1.0.4			+1
	eslint-config-prettier@​10.0.1 ⏵ 10.1.5	+1		+1
	@​lucide/​svelte@​0.483.0 ⏵ 0.511.0	+1		+1	+2
	eslint@​9.20.1 ⏵ 9.28.0
	prettier-plugin-tailwindcss@​0.6.11 ⏵ 0.6.12	+1
	eslint-plugin-svelte@​2.46.1 ⏵ 3.9.1
	tw-animate-css@​1.3.4
	@​internationalized/​date@​3.7.0 ⏵ 3.8.2	+1		+16	+4

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