dashboard: tab strip above banner-thin in chrome (#389)

Swap the order of `.tabbar` and `.banner` inside `.dashboard-chrome`
so the operator's navigation surface sits at the very top of the
sticky/fixed header — the "WE ARE THE WIRED" slug becomes decoration
below the tabs rather than chrome above them.

Applied to both `index.html` (sticky chrome) and `flow.html`
(fixed-overlay chrome).

No CSS changes — `.tabbar { border-bottom }` still divides tabs from
the area below (now the banner), and active-tab `margin-bottom: -1px`
still merges into that boundary cleanly.

frontend/packages/dashboard/src/flow.html

@@ -12,11 +12,10 @@
        (#383) — operator never has to navigate back to the dashboard
        to switch tabs. FL0W is the current page, the SW4RM / Y3R C4LL
        / SYST3M tabs cross-link to the dashboard with the matching
-       hash so the destination tab is pre-active. Banner-thin echoes
-       the dashboard for visual continuity. -->
+       hash so the destination tab is pre-active. Tab strip on top,
+       banner-thin below (#389 — tabs are navigation, slug is
+       decoration). -->
   <header class="dashboard-chrome flow-chrome" id="flow-header">
-    <pre class="banner banner-thin">░▒▓█▓▒░ HYPERHIVE / HIVE-C0RE / WE ARE THE WIRED ░▒▓█▓▒░</pre>
-
     <nav class="tabbar" id="tabbar" role="tablist">
       <a class="tab" href="/#swarm" role="tab" data-tab="swarm">
         <span class="tab-label">◆ SW4RM ◆</span>
@@ -47,6 +46,7 @@
         <span id="notif-status" class="meta" hidden></span>
       </div>
     </nav>
+    <pre class="banner banner-thin">░▒▓█▓▒░ HYPERHIVE / HIVE-C0RE / WE ARE THE WIRED ░▒▓█▓▒░</pre>
   </header>
 
   <!-- Operator inbox flyout trigger — count + click → side panel