settings: add "tasks" button (advanced)

added a GET /tasks route to list tasks with a description (untranslated,
but this is mostly a dev feature anyway). Loaded in a modal by enabling
advanced settings and pressing the Tasks button at the top (where logs,
backups, restart are). Also added some icons in settings, and removed
some redundant "flex flex-row"s on buttons and reduced the spacing in
those with icons to gap-1.

ts/typings/d.ts

@@ -123,6 +123,7 @@ declare interface Modals {
     sendPWR?: Modal;
     pwr?: Modal;
     logs: Modal;
+    tasks: Modal;
     email?: Modal;
     enableReferralsUser?: Modal;
     enableReferralsProfile?: Modal;