Made pausing TL updating configurable. Added styles for disabled checkboxes.

Shuffled settings a bit b/c all the settings are in "Attachments" section
depsite the fact not all of them are attachments-related.

src/App.scss

@@ -142,6 +142,14 @@ input, textarea, .select {
       color: $fallback--fg;
       color: var(--fg, $fallback--fg);
     }
+    &:disabled,
+    {
+      &,
+      & + label,
+      & + label::before {
+        opacity: .5;
+      }
+    }
     + label::before {
       display: inline-block;
       content: '✔';