feat(ui): frontend polish sweep — 8 UX fixes

- DeckyFleet: card click opens inspect side-drawer instead of
  auto-filtering (localSearch filter behavior removed)
- Dashboard: LIVE FEED / DECKIES UNDER SIEGE / TOP ATTACKERS panels
  now have fixed max-height with overflow scroll instead of growing
- parseEventBody: defensive RFC 5424 header strip so raw syslog lines
  from the collector render as k=v pills instead of raw text
- Attackers: search placeholder updated; activity (Active/Passive/
  Inactive) and country chip filters added on top of existing IP search
- Credentials + Bounty: sortable column headers (click to asc/desc/clear)
- SwarmHosts + RemoteUpdates: icon extracted from <h1> into flex div
  with violet-accent class, matching site-wide Identities pattern
- Swarm.css: fix --panel-border undefined variable → --border so the
  title border-bottom line is visible on SwarmHosts and RemoteUpdates

decnet_web/src/components/Attackers.css

@@ -1,7 +1,24 @@
 .attackers-root {
   display: flex;
   flex-direction: column;
-  gap: 20px;
+  gap: 16px;
+}
+
+.ak-filter-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  align-items: center;
+}
+
+.ak-filter-row .chip {
+  cursor: pointer;
+  transition: opacity 0.15s;
+}
+
+.ak-filter-row button {
+  font-family: inherit;
+  font-size: inherit;
 }
 
 .attackers-root .controls-row {