Revert "build: upgrade to svelte v4"

This reverts commit 0a3a215.

package.json

@@ -19,7 +19,7 @@
 		"@playwright/test": "^1.28.1",
 		"@sanity/client": "^6.1.7",
 		"@sveltejs/adapter-auto": "^2.0.0",
-		"@sveltejs/kit": "^1.20.4",
+		"@sveltejs/kit": "^1.5.0",
 		"@typescript-eslint/eslint-plugin": "^5.45.0",
 		"@typescript-eslint/parser": "^5.45.0",
 		"dayjs": "^1.11.9",
@@ -28,10 +28,10 @@
 		"eslint-plugin-svelte3": "^4.0.0",
 		"marked": "^7.0.2",
 		"prettier": "^2.8.0",
-		"prettier-plugin-svelte": "^2.10.1",
+		"prettier-plugin-svelte": "^2.8.1",
 		"sass": "^1.62.1",
-		"svelte": "^4.0.0",
-		"svelte-check": "^3.4.3",
+		"svelte": "^3.54.0",
+		"svelte-check": "^3.0.1",
 		"swiper": "^8.4.2",
 		"tslib": "^2.4.1",
 		"typescript": "^5.0.0",