fix(a11y): accessible names for switches, swatches, selects and inputs

Lighthouse a11y across the authenticated module pages flagged: the clickable
Siftlode logo had aria-label='Feed' (accessible name didn't include its visible
text); the shared Switch, theme swatches, sort selects and several number/range
inputs had no accessible name/label. Give Switch role='switch'+aria-checked and
an optional label (passed at every call site), aria-label the swatches, selects
(feed/playlists sort) and the settings/config/scheduler inputs, and drop the
mismatched logo aria-label so its visible text is the name. All 11 module pages
now score 100 accessibility (settings 86->100, playlists 89->100, others 92-95->100).

frontend/src/components/Sidebar.tsx

@@ -733,7 +733,7 @@ function Toggle({
   return (
     <label className="flex items-center justify-between py-1 cursor-pointer text-sm">
       <span>{label}</span>
-      <Switch checked={checked} onChange={onChange} />
+      <Switch label={label} checked={checked} onChange={onChange} />
     </label>
   );
 }