Add "View Networks": front-facing subnet browse + detail with attached devices

Subnets previously lived only under Settings, easily confused with the Network
Devices asset list. Add a front-facing browse + detail:

- Nav: rename "Network" -> "Network Devices"; add "View Networks" (subnets), both
  under Assets (network plugin get_navigation_items; frontend fallback matched).
- /networks (SubnetsBrowse): all subnets with name / CIDR / type / VLAN / notes,
  searchable, row-click to detail.
- /networks/:id (SubnetDetail): the subnet (CIDR, network address, type, VLAN,
  gateway, notes) plus the network devices whose primary IP falls inside its
  CIDR - get_subnet now computes that membership in Python (a device's IP lives
  in a Communication row, so it is not a plain SQL join).

Verified on the import DB: 37 networks list (real WJ subnets), detail renders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/views/AppLayout.vue

@@ -156,7 +156,8 @@ const defaultNav = [
   { name: 'Map', icon: 'map', route: '/map', position: 4 },
   { name: 'Machines', icon: 'cog', route: '/machines', position: 10 },
   { name: 'PCs', icon: 'desktop', route: '/pcs', position: 15 },
-  { name: 'Network', icon: 'network-wired', route: '/network', position: 18 },
+  { name: 'Network Devices', icon: 'network-wired', route: '/network', position: 18 },
+  { name: 'View Networks', icon: 'globe', route: '/networks', position: 19 },
   { name: 'Printers', icon: 'printer', route: '/printers', position: 20 },
   { name: 'USB Devices', icon: 'usb', route: '/usb', position: 45 },
   { name: 'Applications', icon: 'app-window', route: '/applications', position: 30, section: 'information' },

frontend/src/views/network/SubnetDetail.vue

@@ -0,0 +1,81 @@
+<template>
+  <div class="detail-page">
+    <div v-if="loading" class="loading">Loading...</div>
+    <div v-else-if="!subnet" class="empty-state"><p>Network not found.</p></div>
+    <template v-else>
+      <div class="page-header">
+        <h1>{{ subnet.name || subnet.cidr }}</h1>
+        <router-link to="/networks" class="btn btn-secondary">Back to Networks</router-link>
+      </div>
+
+      <div class="content-grid">
+        <div class="content-column">
+          <div class="section-card">
+            <h3 class="section-title">Network</h3>
+            <div class="info-list">
+              <div class="info-row"><span class="info-label">CIDR</span><span class="info-value mono">{{ subnet.cidr }}</span></div>
+              <div class="info-row"><span class="info-label">Network Address</span><span class="info-value mono">{{ subnet.networkaddress || '-' }}</span></div>
+              <div class="info-row"><span class="info-label">Type</span><span class="info-value">{{ subnet.subnettype || '-' }}</span></div>
+              <div class="info-row"><span class="info-label">VLAN</span><span class="info-value">{{ subnet.vlannumber || subnet.vlanid || '-' }}</span></div>
+              <div class="info-row" v-if="subnet.gatewayip"><span class="info-label">Gateway</span><span class="info-value mono">{{ subnet.gatewayip }}</span></div>
+            </div>
+          </div>
+
+          <div class="section-card" v-if="subnet.description">
+            <h3 class="section-title">Notes</h3>
+            <div class="notes-content">{{ subnet.description }}</div>
+          </div>
+        </div>
+
+        <div class="content-column">
+          <div class="section-card">
+            <h3 class="section-title">Devices on this network ({{ devices.length }})</h3>
+            <div v-if="devices.length === 0" class="empty-state"><p>No devices found in this range.</p></div>
+            <div v-else class="table-container">
+              <table>
+                <thead>
+                  <tr><th>Device</th><th>IP</th><th>Type</th></tr>
+                </thead>
+                <tbody>
+                  <tr v-for="dev in devices" :key="dev.networkdeviceid">
+                    <td>
+                      <router-link :to="`/network/${dev.networkdeviceid}`">
+                        {{ dev.name || dev.hostname || dev.assetnumber }}
+                      </router-link>
+                    </td>
+                    <td class="mono">{{ dev.ipaddress }}</td>
+                    <td>{{ dev.networkdevicetypename || '-' }}</td>
+                  </tr>
+                </tbody>
+              </table>
+            </div>
+          </div>
+        </div>
+      </div>
+    </template>
+  </div>
+</template>
+
+<script setup>
+import { ref, computed, onMounted } from 'vue'
+import { useRoute } from 'vue-router'
+import { networkApi } from '@/api'
+
+const route = useRoute()
+const subnet = ref(null)
+const loading = ref(true)
+
+const devices = computed(() => subnet.value?.devices || [])
+
+async function load() {
+  loading.value = true
+  try {
+    const response = await networkApi.subnets.get(route.params.id)
+    subnet.value = response.data?.data || response.data
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(load)
+</script>

frontend/src/views/network/SubnetsBrowse.vue

@@ -0,0 +1,79 @@
+<template>
+  <div>
+    <div class="page-header">
+      <h1>Networks</h1>
+    </div>
+
+    <div class="filters">
+      <input v-model="search" type="text" placeholder="Search networks..." class="search-input" />
+    </div>
+
+    <div class="card">
+      <div v-if="loading" class="loading">Loading...</div>
+      <div v-else-if="filtered.length === 0" class="empty-state"><p>No networks found.</p></div>
+      <div v-else class="table-container">
+        <table>
+          <thead>
+            <tr>
+              <th>Name</th>
+              <th>CIDR</th>
+              <th>Type</th>
+              <th>VLAN</th>
+              <th>Notes</th>
+              <th class="actions"></th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr v-for="subnet in filtered" :key="subnet.subnetid" class="clickable-row"
+                @click="$router.push(`/networks/${subnet.subnetid}`)">
+              <td>{{ subnet.name || '-' }}</td>
+              <td class="mono">{{ subnet.cidr }}</td>
+              <td>{{ subnet.subnettype || '-' }}</td>
+              <td>{{ subnet.vlannumber || subnet.vlanid || '-' }}</td>
+              <td class="cell-truncate" :title="subnet.description">{{ subnet.description || '-' }}</td>
+              <td class="actions">
+                <router-link :to="`/networks/${subnet.subnetid}`" class="btn btn-sm btn-secondary" @click.stop>View</router-link>
+              </td>
+            </tr>
+          </tbody>
+        </table>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { ref, computed, onMounted } from 'vue'
+import { networkApi } from '@/api'
+
+const subnets = ref([])
+const loading = ref(true)
+const search = ref('')
+
+const filtered = computed(() => {
+  const term = search.value.trim().toLowerCase()
+  if (!term) return subnets.value
+  return subnets.value.filter(s =>
+    (s.name || '').toLowerCase().includes(term) ||
+    (s.cidr || '').toLowerCase().includes(term) ||
+    (s.subnettype || '').toLowerCase().includes(term) ||
+    (s.description || '').toLowerCase().includes(term))
+})
+
+async function load() {
+  loading.value = true
+  try {
+    const response = await networkApi.subnets.list({ per_page: 1000 })
+    subnets.value = response.data?.data || response.data || []
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(load)
+</script>
+
+<style scoped>
+.clickable-row { cursor: pointer; }
+.clickable-row:hover { background: var(--bg); }
+</style>