fix(ui): follow-up polish — icons, dashboard bar, filter redesign, bounty/creds sort

- Dashboard: fix invisible bar at bottom of LIVE FEED by constraining
  max-height on the section instead of the inner container; same fix
  for side panels
- Page icons: add violet-accent icon beside h1 on all 9 missing pages
  (CanaryTokens, RealismConfig, SyntheticFiles, PersonaGeneration,
  Attackers, Webhooks, LiveLogs, Topologies, DecoyFleet)
- Attackers filter chips: replace ad-hoc chip buttons with seg-group
  tabs (ALL / ACTIVE N / PASSIVE N / INACTIVE N) matching Credential
  Vault style; country chips use same seg-group treatment
- Credential Vault: add sortable headers to REUSE tab (LAST SEEN,
  PRINCIPAL, KIND, TARGETS, ATTEMPTS); reuses same SortTh pattern
- Bounty: remove CREDENTIALS and PAYLOADS tabs; keep ALL, ARTIFACTS,
  FINGERPRINTS; add EMAIL (artifact subtype, filtered client-side)

decnet_web/src/components/DeckyFleet.tsx

@@ -1553,7 +1553,10 @@ const DeckyFleet: React.FC<FleetProps> = ({ searchQuery = '' }) => {
     <div className="fleet-root">
       <div className="page-header">
         <div className="page-title-group">
-          <h1>DECOY FLEET</h1>
+          <div style={{ display: 'flex', alignItems: 'center', gap: 12 }}>
+            <Server size={22} className="violet-accent" />
+            <h1>DECOY FLEET</h1>
+          </div>
           <span className="page-sub">
             {deckies.length} DECKIES DEPLOYED · {counts.active + counts.hot} ACTIVE · {counts.hot} UNDER SIEGE
             {deployMode && (