chore(panel): fleet-aware shell footer + drop dead vuefinder dep

COA-B cleanup:
- Sidebar agent-health footer now reads the fleet store (host count / online
  count / per-host status + last heartbeat) instead of the single legacy
  server.connection row, which disagreed with the multi-host fleet. Removed the
  legacy useServerStore dependency from the shell.
- Removed the unused 'vuefinder' dependency (replaced by the native file
  manager): dep + main.ts plugin/CSS registration. Main JS chunk 588kB -> 165kB.

Recon reclassified the 'dead cmd.server v1' item: it is the LIVE license-level
command path (module config applies, plugin install, schedules, legacy
start/stop) served only by the Go agent — a Rust-agent parity gap, not dead
code. Left intact.

Build-green (vue-tsc) + boots clean in-browser (0 console errors).

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

frontend/src/components/layout/DashboardLayout.vue

@@ -9,7 +9,6 @@
 import { ref, computed, watch, onMounted } from 'vue'
 import { RouterView, useRoute, useRouter } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
-import { useServerStore } from '@/stores/server'
 import { useFleetStore } from '@/stores/fleet'
 import { useThemeGame, syncActiveGameFromFleet } from '@/composables/useThemeGame'
 import { useGameProfile } from '@/config/gameProfiles'
@@ -31,7 +30,6 @@ import type { ActiveGame } from '@/composables/useThemeGame'
 const route = useRoute()
 const router = useRouter()
 const auth = useAuthStore()
-const server = useServerStore()
 const fleet = useFleetStore()
 const { theme, activeGame, setActiveGame, toggleTheme } = useThemeGame()
 
@@ -106,32 +104,43 @@ function hasVisibleItems(section: NavSection): boolean {
   return section.items.some(canShowNavItem)
 }
 
-// ---- Agent health ----
-const hasAgent = computed(() => server.connection !== null)
+// ---- Agent health — driven by the fleet, not the legacy single connection ----
+// Real hosts only (the fleet response appends a synthetic '__unassigned__'
+// bucket for orphaned instances; summary counts already exclude it).
+const realHosts = computed(() => fleet.hosts.filter((h) => h.id !== '__unassigned__'))
+const hostCount = computed(() => fleet.summary.host_count)
+const onlineHosts = computed(() => fleet.summary.online_host_count)
+const instanceCount = computed(() => fleet.summary.instance_count)
+
+const hasAgent = computed(() => hostCount.value > 0)
 
 const agentTone = computed(() => {
-  const cs = server.connection?.connection_status
-  if (cs === 'connected') return 'online' as const
-  if (cs === 'degraded') return 'warn' as const
-  return 'offline' as const
+  if (onlineHosts.value === 0) return 'offline' as const
+  if (onlineHosts.value < hostCount.value) return 'warn' as const
+  return 'online' as const
 })
 const agentLabel = computed(() => {
-  const cs = server.connection?.connection_status
-  if (cs === 'connected') return 'Healthy'
-  if (cs === 'degraded') return 'Degraded'
-  return 'Offline'
+  if (onlineHosts.value === 0) return 'Offline'
+  if (onlineHosts.value < hostCount.value) return 'Degraded'
+  return 'Healthy'
 })
-const agentName = computed(() => server.connection?.server_ip ?? 'Host agent')
+// One host → its hostname; multiple → fleet count.
+const agentName = computed(() =>
+  hostCount.value === 1 ? (realHosts.value[0]?.hostname ?? 'Host agent') : `${hostCount.value} hosts`,
+)
 
 const agentMetaLine = computed(() => {
-  const cs = server.connection?.connection_status
-  let line = cs === 'connected' ? 'Connected' : server.connection?.companion_last_seen
-    ? `Last seen ${safeDate(server.connection.companion_last_seen)}`
-    : 'Awaiting first heartbeat'
-  if (server.stats) {
-    line += ` · ${server.stats.player_count}/${server.stats.max_players} players`
+  const insts = `${instanceCount.value} ${instanceCount.value === 1 ? 'instance' : 'instances'}`
+  if (hostCount.value === 1) {
+    const h = realHosts.value[0]
+    const state = h?.status === 'connected'
+      ? 'Connected'
+      : h?.last_heartbeat_at
+        ? `Last seen ${safeDate(h.last_heartbeat_at)}`
+        : 'Awaiting first heartbeat'
+    return `${state} · ${insts}`
   }
-  return line
+  return `${onlineHosts.value}/${hostCount.value} online · ${insts}`
 })
 
 // ---- Topbar ----