hive ui: remove the BUILD L0GS tab and the live build-log panel

A build's output and history are the swarm's builds Grafana board now, from the
lines hive-c0re logs. Removes the tab and its pane, the live log under the
rebuild queue, their styles, the log stream helper and the duration formatter
only they used, and the docs; also the tab-counts sentence 5925 missed.

frontend/packages/dashboard/src/tabs.js

@@ -24,11 +24,7 @@ import {
   renderContainers,
   renderSelectionBar,
 } from "./agents.js";
-import {
-  initBuilds,
-  onBuildsTabShown,
-  onRebuildQueueChanged,
-} from "./builds.js";
+import { initBuilds, onRebuildQueueChanged } from "./builds.js";
 import {
   applyTombstonesChanged,
   renderKept,
@@ -260,7 +256,7 @@ import { renderUserMenu } from "./user-menu.js";
   })();
 
   // ─── tab routing ───────────────────────────────────────────────────────
-  // Hash-based: `#agents` / `#rebuild` / `#buildlogs` / `#kept`
+  // Hash-based: `#agents` / `#rebuild` / `#kept`
   // activate the matching pane on the dashboard. Empty
   // hash defaults to 4G3NTS. ST4TS is NOT a tab — it is a separate page
   // (`/stats.html`) reached from the pages menu (links-menu.js). Tab routing
@@ -276,7 +272,6 @@ import { renderUserMenu } from "./user-menu.js";
     // visibility (bar only belongs on 4G3NTS where agent cards live).
     document.body.dataset.activeTab = target;
     renderSelectionBar(Array.from(containersState.values()));
-    onBuildsTabShown(target);
   }
 
   // Wire the shared tab strip now that activateTab + the lazy-load fns it