Remove unused frontend npm dependencies (#3935)

* Remove unused frontend npm dependencies

* Add a guard on database open

frontend/package.json

@@ -28,17 +28,13 @@
 	},
 	"//": "NOTE: `source-sans-pro` is never to be upgraded to 3.x because that renders 1px above its intended position.",
 	"dependencies": {
-		"idb-keyval": "^6.2.2",
 		"source-code-pro": "2.42.0",
 		"source-sans-pro": "2.45.0"
 	},
 	"devDependencies": {
-		"@eslint/compat": "^2.0.3",
-		"@eslint/eslintrc": "^3.3.5",
 		"@eslint/js": "^9.39.2",
 		"@sveltejs/vite-plugin-svelte": "^7.0.0",
 		"@types/node": "^25.5.0",
-		"buffer": "^6.0.3",
 		"concurrently": "^9.2.1",
 		"eslint": "^9.39.2",
 		"eslint-import-resolver-typescript": "^4.4.4",
@@ -46,17 +42,14 @@
 		"eslint-plugin-prettier": "^5.5.5",
 		"eslint-plugin-svelte": "^3.16.0",
 		"globals": "^17.4.0",
-		"svelte-check": "^4.4.5",
 		"license-checker-rseidelsohn": "^4.4.2",
-		"postcss": "^8.5.8",
 		"prettier": "^3.8.1",
 		"prettier-plugin-svelte": "^3.5.1",
-		"process": "^0.11.10",
 		"sass": "^1.98.0",
 		"svelte": "^5.54.1",
+		"svelte-check": "^4.4.5",
 		"svelte-preprocess": "^6.0.3",
 		"tar": "^7.5.12",
-		"ts-node": "^10.9.2",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.57.1",
 		"vite": "^8.0.1",