Close the gaps against the design: critical tile, filters, policy card, action placement

Four things the mockup showed and the first cut did not have.

FLEET
  - A 'with critical events' tile, from the stability route that existed and
    nothing called. Clicking it narrows to rows whose health is not ok - client
    side, because the health rollup is assembled per row after pagination, so
    it narrows the PAGE rather than the fleet. Worth knowing before the count
    is read as fleet-wide.
  - PC type and Location filters. The list route already accepted both; there
    was simply no control. Both use listAll, not list: perpage is clamped to
    100 server-side, so a long location list would lose its tail in a dropdown
    while still looking complete.
  - The machine cell shows number and name together where they differ, so
    '3105 Okuma' rather than a bare number.

PC DETAIL
  - A Policy card, contributed by the computers plugin. It matters because the
    effective policy already narrows the command allowlist, so without it the
    reason a control is unavailable on a given PC is written down nowhere.
    Provenance, so it sits in the reference column, not the triage band.

    Its route returns an EMPTY field list rather than the feature-gate 404 when
    policies are disabled. The panel contract hides a card with no fields, so
    it disappears on sites that have not enabled the feature - a 404 would have
    rendered a broken card on most of them. That was flagged in the design
    review as a snag; this is the fix.

  - Refresh Status and Restart Computer moved out of the page header into the
    triage band. They act on the MACHINE; Print Label, Edit, Retire and Back to
    List act on the RECORD, and mixing them put the most consequential button
    on the page - it halts whatever machine the PC serves - between printing a
    sticker and editing a form. In the band it sits beside the liveness chip
    and the machine it would take down.

    The band takes them through an 'actions' slot rather than knowing about PC
    verbs, so a measuring tool can put 'Calibrate' there without the core
    component learning anything about computers.

Full suite 2124 passed, vitest 260 passed, gates green, spec at 333 paths.

plugins/endpoints/frontend/views/EndpointsList.vue

@@ -7,7 +7,7 @@
     <!-- Summary strip. Wired to dashboard routes that already existed and
          nothing called; each tile is a filter shortcut, not just a number. -->
     <div v-if="summary" class="fleet-tiles">
-      <button class="fleet-tile" :class="{ on: status === '' }" @click="setStatus('')">
+      <button class="fleet-tile" :class="{ on: status === '' && !problemsonly }" @click="clearFilters">
         <span class="n">{{ summary.total }}</span><span class="l">Endpoints</span>
       </button>
       <button class="fleet-tile ok" :class="{ on: status === 'reporting' }" @click="setStatus('reporting')">
@@ -19,6 +19,11 @@
       <button class="fleet-tile bad" :class="{ on: status === 'never' }" @click="setStatus('never')">
         <span class="n">{{ summary.never }}</span><span class="l">Never reported</span>
       </button>
+      <!-- Crash, shutdown and corruption events in the stability window. The
+           route existed and nothing called it. -->
+      <button class="fleet-tile bad" :class="{ on: problemsonly }" @click="toggleProblems">
+        <span class="n">{{ criticalcount }}</span><span class="l">With critical events</span>
+      </button>
     </div>
 
     <!-- Filters -->
@@ -36,6 +41,18 @@
         <option value="quiet">Quiet</option>
         <option value="never">Never reported</option>
       </select>
+      <select v-model="computertypeid" class="form-control fleet-filter" @change="applyFilters">
+        <option value="">All PC types</option>
+        <option v-for="type in computertypes" :key="type.computertypeid" :value="type.computertypeid">
+          {{ type.computertype }}
+        </option>
+      </select>
+      <select v-model="locationid" class="form-control fleet-filter" @change="applyFilters">
+        <option value="">All locations</option>
+        <option v-for="place in locations" :key="place.locationid" :value="place.locationid">
+          {{ place.locationname }}
+        </option>
+      </select>
       <select v-model="sort" class="form-control fleet-filter" @change="applyFilters">
         <option value="status">Sort: worst first</option>
         <option value="hostname">Sort: hostname</option>
@@ -82,7 +99,7 @@
                   <!-- What stops if this PC is dead. On a shop floor that is
                        the first thing anyone needs to know. -->
                   <span v-if="!item.machines || !item.machines.length">-</span>
-                  <span v-else>{{ item.machines.map(m => m.assetnumber).join(', ') }}</span>
+                  <span v-else>{{ item.machines.map(machineLabel).join(', ') }}</span>
                 </td>
                 <td>{{ item.computertype || '-' }}</td>
                 <td>
@@ -119,7 +136,7 @@
 <script setup>
 import { ref, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
-import { endpointsApi } from '@/api'
+import { endpointsApi, computersApi, locationsApi } from '@/api'
 import PaginationBar from '@/components/PaginationBar.vue'
 import { useListQuery } from '@/composables/listQuery'
 
@@ -140,18 +157,42 @@ const status = ref('')
 // endpoints to the top and buries the ones somebody needs to act on.
 const sort = ref('status')
 const summary = ref(null)
+const criticalcount = ref(0)
+const computertypeid = ref('')
+const locationid = ref('')
+const problemsonly = ref(false)
+const computertypes = ref([])
+const locations = ref([])
 
 let searchTimeout = null
 
 onMounted(() => {
   loadEndpoints()
   loadSummary()
+  loadFilterOptions()
 })
 
+async function loadFilterOptions() {
+  // listAll, not list: perpage is clamped to 100 server-side, so a long type or
+  // location list would silently lose its tail in a dropdown.
+  try {
+    computertypes.value = await computersApi.types.listAll()
+  } catch (error) {
+    computertypes.value = []
+  }
+  try {
+    locations.value = await locationsApi.listAll()
+  } catch (error) {
+    locations.value = []
+  }
+}
+
 async function loadSummary() {
   try {
     const response = await endpointsApi.dashboardSummary()
     summary.value = response.data.data || null
+    const stability = await endpointsApi.dashboardStability()
+    criticalcount.value = (stability.data.data || []).length
   } catch (error) {
     // The strip is a convenience, not the page. If it fails the table still
     // works, so say nothing rather than blocking on it.
@@ -169,10 +210,15 @@ async function loadEndpoints() {
     if (search.value) params.search = search.value
     if (status.value) params.status = status.value
     if (sort.value) params.sort = sort.value
+    if (computertypeid.value) params.computertypeid = computertypeid.value
+    if (locationid.value) params.locationid = locationid.value
 
     loadError.value = ''
     const response = await endpointsApi.list(params)
-    endpoints.value = response.data.data || []
+    const rows = response.data.data || []
+    endpoints.value = problemsonly.value
+      ? rows.filter(row => row.health && row.health.level !== 'ok')
+      : rows
     totalPages.value = response.data.meta?.pagination?.totalpages || response.data.meta?.pagination?.total_pages || 1
   } catch (error) {
     console.error('Error loading endpoints:', error)
@@ -217,9 +263,33 @@ function formatRelative(value) {
 
 function setStatus(value) {
   status.value = value
+  problemsonly.value = false
   applyFilters()
 }
 
+function clearFilters() {
+  status.value = ''
+  problemsonly.value = false
+  applyFilters()
+}
+
+// Client-side, unlike the other filters: "has a problem" is the health rollup,
+// which is assembled per row after pagination rather than in the query. Sorting
+// already puts trouble first, so this narrows the page rather than the fleet -
+// worth knowing before someone reads the count as fleet-wide.
+function toggleProblems() {
+  problemsonly.value = !problemsonly.value
+  status.value = ''
+  applyFilters()
+}
+
+function machineLabel(machine) {
+  if (machine.name && machine.assetnumber && machine.name !== machine.assetnumber) {
+    return `${machine.assetnumber} ${machine.name}`
+  }
+  return machine.assetnumber || machine.name || ''
+}
+
 function applyFilters() {
   setPage(1)
   loadEndpoints()