chore: unbreak prettier by bumping prettier-plugin-tailwindcss

prettier-plugin-tailwindcss 0.6.14 is incompatible with prettier 3.8.1 and
threw "getVisitorKeys is not a function" on every .svelte file, so `pnpm
lint` could not run at all. 0.8.1 fixes it.

No reformatting here: the files prettier now reports are mostly vendored
shadcn components, and rewriting those is unrelated to any current work.

frontend/package.json

@@ -33,8 +33,8 @@
 		"jsrepo": "^2.5.2",
 		"openapi-typescript": "^7.13.0",
 		"prettier": "^3.8.1",
-		"prettier-plugin-svelte": "^3.5.1",
-		"prettier-plugin-tailwindcss": "^0.6.14",
+		"prettier-plugin-svelte": "^3.5.2",
+		"prettier-plugin-tailwindcss": "^0.8.1",
 		"svelte": "^5.53.7",
 		"svelte-check": "^4.4.5",
 		"tailwind-merge": "^3.5.0",