Remove unnecessary TODOs

ad responsive.ts: min with 2 columns is fine

picture-gallery-client/package.json

@@ -13,9 +13,8 @@
     "client:run": "npm run client:build && npm run client:start",
     "client:start": "vite",
     "set-environment": "npx import-meta-env -x .env.example",
-    "client:test": "TODO",
-    "test": "vitest",
-    "coverage": "vitest run --coverage"
+    "client:test": "vitest",
+    "client:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "@emotion/react": "^11.13.0",

picture-gallery-client/src/util/responsive.ts

@@ -2,7 +2,6 @@ import useMediaQuery from "@mui/material/useMediaQuery";
 
 const breakpoints = Object.freeze([1200, 600, 300, 0]);
 
-// TODO: never can be one column at the moment
 export function useColumns(): number {
   const values = [5, 4, 3, 2];
   const index = breakpoints