feat(fleet): §16 orchestrator tab foundation (Deployments, Federation, Secrets) (#856)

Reserves three navigable but non-functional tab slots on the Fleet page so
each future orchestrator surface can land as a tab content swap rather than
a navigation redesign. Each tab opens a coming-soon placeholder card listing
the planned actions for that surface.

frontend/src/components/FleetView.tsx

@@ -4,6 +4,7 @@ import {
     Layers, Wifi, WifiOff, Search, ArrowUpDown, AlertTriangle,
     Play, Square, RotateCcw, ExternalLink, Camera, Download, Loader2, Check,
     CircleCheck, CircleAlert, Globe, Monitor, X, LayoutGrid, Network, SlidersHorizontal,
+    Send, KeyRound,
 } from 'lucide-react';
 import { FleetMasthead } from './fleet/FleetMasthead';
 import { FleetTopology } from './fleet/FleetTopology';
@@ -28,6 +29,7 @@ import { useLicense } from '@/context/LicenseContext';
 import { PaidGate } from './PaidGate';
 import FleetSnapshots from './FleetSnapshots';
 import { FleetConfiguration } from './fleet/FleetConfiguration';
+import { FleetSoonPlaceholder, SoonBadge } from './fleet/FleetSoonPlaceholder';
 import { toast } from '@/components/ui/toast-store';
 import { LabelDot } from './LabelPill';
 import { type Label as StackLabel, type LabelColor } from './label-types';
@@ -1047,6 +1049,25 @@ export function FleetView({ onNavigateToNode }: FleetViewProps) {
                                     <SlidersHorizontal className="w-4 h-4 mr-1.5" />Status
                                 </TabsTrigger>
                             </TabsHighlightItem>
+                            <span aria-hidden className="self-center mx-1 h-4 w-px bg-border" />
+                            <TabsHighlightItem value="deployments">
+                                <TabsTrigger value="deployments">
+                                    <Send className="w-4 h-4 mr-1.5" />Deployments
+                                    <SoonBadge />
+                                </TabsTrigger>
+                            </TabsHighlightItem>
+                            <TabsHighlightItem value="federation">
+                                <TabsTrigger value="federation">
+                                    <Network className="w-4 h-4 mr-1.5" />Federation
+                                    <SoonBadge />
+                                </TabsTrigger>
+                            </TabsHighlightItem>
+                            <TabsHighlightItem value="secrets">
+                                <TabsTrigger value="secrets">
+                                    <KeyRound className="w-4 h-4 mr-1.5" />Secrets
+                                    <SoonBadge />
+                                </TabsTrigger>
+                            </TabsHighlightItem>
                         </TabsHighlight>
                     </TabsList>
                     <div className="flex items-center gap-2">
@@ -1346,6 +1367,33 @@ export function FleetView({ onNavigateToNode }: FleetViewProps) {
                 <TabsContent value="configuration">
                     <FleetConfiguration />
                 </TabsContent>
+                <TabsContent value="deployments">
+                    <FleetSoonPlaceholder
+                        icon={<Send className="h-4 w-4" />}
+                        kicker="Deployments · Coming soon"
+                        title="Push stacks across the fleet"
+                        description="Push a stack from local to a remote in one move. Side-by-side compose diff, env reconciliation, volume migration plan."
+                        plannedActions={['Push stack', 'Promote env', 'Diff config', 'Plan migration']}
+                    />
+                </TabsContent>
+                <TabsContent value="federation">
+                    <FleetSoonPlaceholder
+                        icon={<Network className="h-4 w-4" />}
+                        kicker="Federation · Coming soon"
+                        title="The fleet as one logical surface"
+                        description="Pin policies, drain a node for maintenance, weight-aware scheduling. This stack runs on whichever node has capacity."
+                        plannedActions={['Pin policy', 'Drain node', 'Cordon', 'Capacity plan']}
+                    />
+                </TabsContent>
+                <TabsContent value="secrets">
+                    <FleetSoonPlaceholder
+                        icon={<KeyRound className="h-4 w-4" />}
+                        kicker="Secrets · Coming soon"
+                        title="One source of truth for env, creds and certs"
+                        description="Push to selected nodes, rotate centrally, audit who-saw-what. Solves silent drift across copies."
+                        plannedActions={['Sync env', 'Rotate', 'Audit', 'Pin to nodes']}
+                    />
+                </TabsContent>
             </Tabs>
 
             {/* Reconnecting overlay shown when local node is updating */}

frontend/src/components/fleet/FleetSoonPlaceholder.tsx

@@ -0,0 +1,67 @@
+import type { ReactNode } from 'react';
+
+export function SoonBadge() {
+  return (
+    <span className="ml-1.5 font-mono text-[9px] uppercase tracking-[0.2em] text-brand">
+      SOON
+    </span>
+  );
+}
+
+interface FleetSoonPlaceholderProps {
+  icon: ReactNode;
+  kicker: string;
+  title: string;
+  description: string;
+  plannedActions: string[];
+}
+
+export function FleetSoonPlaceholder({
+  icon,
+  kicker,
+  title,
+  description,
+  plannedActions,
+}: FleetSoonPlaceholderProps) {
+  return (
+    <div className="mx-auto max-w-3xl rounded-xl border border-card-border border-t-card-border-top bg-card shadow-card-bevel">
+      <div className="flex flex-col gap-5 p-8">
+        <div className="flex items-center justify-between gap-3">
+          <div className="inline-flex items-center gap-2 text-brand">
+            <span className="inline-flex h-4 w-4 items-center justify-center" aria-hidden>
+              {icon}
+            </span>
+            <span className="font-mono text-[10px] uppercase tracking-[0.2em]">{kicker}</span>
+          </div>
+          <span className="rounded border border-brand/20 bg-brand/10 px-1.5 py-0.5 font-mono text-[9px] uppercase tracking-[0.2em] text-brand">
+            Coming soon
+          </span>
+        </div>
+
+        <h3 className="font-serif text-2xl italic leading-tight tracking-[-0.01em] text-stat-value">
+          {title}
+        </h3>
+
+        <p className="font-sans text-sm leading-relaxed text-stat-subtitle">
+          {description}
+        </p>
+
+        <div className="flex flex-col gap-2 border-t border-border pt-4">
+          <span className="font-mono text-[10px] uppercase tracking-[0.2em] text-stat-icon">
+            Planned actions
+          </span>
+          <div className="flex flex-wrap gap-1.5">
+            {plannedActions.map((action) => (
+              <span
+                key={action}
+                className="rounded border border-border bg-muted/40 px-2 py-1 font-mono text-[9px] uppercase tracking-[0.14em] text-stat-subtitle"
+              >
+                {action}
+              </span>
+            ))}
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}