fix(frontend): make the panel usable with screen readers (#6907)

* fix(frontend): make the panel usable with screen readers

* fix(frontend): keep mobile tab names and the inbound expiry hint

Review of #6907 found two gaps in the screen-reader pass:

- On phone-width screens catTabLabel renders only the icon and names the
  tab by putting aria-label on it, but callers now pass that icon with
  aria-hidden for the desktop label, so every Settings, Xray and Host
  category tab lost its name under TalkBack. catTabLabel now clears
  aria-hidden on the icon it uses as the name.
- DateTimePicker forwarded id and aria-label but not aria-describedby,
  so the inbound expiry hint ("leave blank to never expire") was never
  attached. It now forwards it on both the Gregorian and Jalali input.

frontend/src/pages/clients/BulkAttachInboundsModal.tsx

@@ -111,6 +111,7 @@ export default function BulkAttachInboundsModal({
               onChange={setTargetIds}
               options={targetOptions}
               placeholder={t('pages.clients.attachToInboundsTargets')}
+              aria-label={t('pages.clients.attachToInboundsTargets')}
               showSearch={{ optionFilterProp: 'label' }}
               autoFocus
             />