Warranty polish: hero badges everywhere, search/pagination, re-check, shared apiError

- Shared utils/apiError.js reads the correct nested error message (with
  fallbacks); swept 37 views/components off the shallow path so real backend
  messages (e.g. in-use 409s) surface instead of generic "Failed".
- useWarrantyBadge composable: warranty hero status/end-date badge now on PC,
  equipment, printer, and network detail heroes (one shared fetch feeds the
  badge + the WarrantyPanel).
- Warranties list: client-side search (vendor/level/tag/asset) + pagination;
  truncate long service levels so they stop blowing out the table width.
- "Re-check all" button + POST /warranty/sync/dell?all=true to re-pull dated
  Dell warranties, not just missing ones.
- Deprecate the standalone pxe-images/warranty_sync.py in favor of the plugin.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/views/machines/MachineForm.vue

@@ -353,6 +353,7 @@ import Modal from '../../components/Modal.vue'
 import CustomFieldsInputs from '../../components/CustomFieldsInputs.vue'
 import { currentTheme } from '../../stores/theme'
 import { useIdentifierFlags } from '../../composables/identifierSettings'
+import { apiError } from '../../utils/apiError'
 
 const { isEnabled } = useIdentifierFlags()
 
@@ -606,7 +607,7 @@ async function saveEquipment() {
     router.push(`/machines/${savedEquipment.equipment?.equipmentid || route.params.id}`)
   } catch (err) {
     console.error('Error saving equipment:', err)
-    error.value = err.response?.data?.message || 'Failed to save equipment'
+    error.value = apiError(err, 'Failed to save equipment')
   } finally {
     saving.value = false
   }