fix: various fixes and remove unused code

src/modules/helpers/interval.js

@@ -1,31 +0,0 @@
-// based on https://stackoverflow.com/a/47009962
-// it has been brought to my attention (many) times that this is horribly broken if the time
-// on the "Change every" setting is longer than 1 minute. I wasn't going to wait days to see
-// if the function worked, so i just assumed it did. i apologise. this function will be
-// replaced entirely in the future probably
-export default function interval(callback, interval, name) {
-  const key = name + 'interval';
-  const ms = localStorage.getItem(key);
-  const now = Date.now();
-
-  const executeCallback = () => {
-    localStorage.setItem(key, Date.now());
-    callback();
-  };
-
-  if (ms) {
-    const delta = now - parseInt(ms);
-    if (delta > interval) {
-      setInterval(executeCallback, interval);
-    } else {
-      setTimeout(() => {
-        setInterval(executeCallback, interval);
-        executeCallback();
-      }, interval - delta);
-    }
-  } else {
-    setInterval(executeCallback, interval);
-  }
-
-  localStorage.setItem(key, now);
-}