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/composables/warrantyBadge.js

@@ -0,0 +1,44 @@
+// Shared warranty fetch + hero-badge derivation for asset detail pages.
+// Pass a getter for the asset id; get back the warranties list (to feed a
+// WarrantyPanel) and a heroWarranty for a compact status badge.
+import { ref, computed, watch } from 'vue'
+import { warrantyApi } from '../api'
+
+const STATUS_RANK = { expired: 0, expiring: 1, active: 2, unknown: 3 }
+const STATUS_LABELS = {
+  active: 'Under Warranty',
+  expiring: 'Warranty Expiring',
+  expired: 'Warranty Expired',
+  unknown: 'Warranty',
+}
+
+export function useWarrantyBadge(getAssetId) {
+  const warranties = ref([])
+
+  // Worst-case warranty drives the badge: expired > expiring > active > unknown.
+  const heroWarranty = computed(() => {
+    if (!warranties.value.length) return null
+    const worst = [...warranties.value]
+      .sort((a, b) => (STATUS_RANK[a.status] ?? 9) - (STATUS_RANK[b.status] ?? 9))[0]
+    return { ...worst, label: STATUS_LABELS[worst.status] || 'Warranty' }
+  })
+
+  function warrantyDate(d) {
+    return d ? new Date(d + 'T00:00:00').toLocaleDateString() : ''
+  }
+
+  async function load() {
+    const assetid = getAssetId()
+    if (!assetid) { warranties.value = []; return }
+    try {
+      const response = await warrantyApi.forAsset(assetid)
+      warranties.value = response.data.data || []
+    } catch (err) {
+      warranties.value = []
+    }
+  }
+
+  watch(getAssetId, load, { immediate: true })
+
+  return { warranties, heroWarranty, warrantyDate, reloadWarranties: load }
+}