refactor(dashboard): drop the P33RS tab, fold peers + identity into SW4RM (#1535)

Removes the standalone P33RS tab + pane. Peer hives now render as a
headline section at the bottom of the SW4RM pane; the swarm/hive name
moves off the cramped strip above the tabbar into a headline at the top
of SW4RM. Both are quiet when nothing's configured:

- swarm/hive identity → `#swarm-identity` h2 in the SW4RM pane (hidden
  until hive_name/swarm_name are set), replacing the `#hive-identity`
  banner-thin line above the tabbar.
- peer hives → `#peers-block` headline + `#peers-section` cards in the
  SW4RM pane. When no peers are federated the headline block is hidden
  entirely and a grey "no peer hives configured" note shows in its place.
- drops `peers` from the tab list + the per-refresh peers-tab gating;
  renderPeerHives now toggles its own headline.

No backend change — still reads `state.peer_hives` + `hive_name` /
`swarm_name`. Build green.

frontend/packages/dashboard/src/dashboard.html

@@ -22,10 +22,6 @@
          dashboard all link back to the landing page rather than to each
          other — H0M3 is the single navigation hub. -->
     <a class="dash-home-back" href="/" title="back to the H0M3 menu">← home</a>
-    <!-- Hive identity line: swarm/hive label. Hidden until JS populates
-         it from /api/state (hive_name + swarm_name). Falls back to
-         hostname when only the domain is configured. -->
-    <p class="banner-thin" id="hive-identity" hidden></p>
     <nav class="tabbar" id="tabbar" role="tablist">
       <a class="tab" id="tab-swarm" href="#swarm" role="tab"
          aria-controls="tab-pane-swarm"
@@ -73,14 +69,8 @@
         <span class="tab-label">◆ ST4TS ◆</span>
       </a>
 
-      <!-- P33RS: peer hive navigation links. Hidden until at least one
-           peer is configured in `services.hyperhive.peers`. -->
-      <a class="tab" id="tab-peers" href="#peers" role="tab"
-         aria-controls="tab-pane-peers"
-         data-tab="peers" hidden>
-        <span class="tab-label">◆ P33RS ◆</span>
-        <span class="tab-count" id="tab-count-peers" hidden></span>
-      </a>
+      <!-- (Peer hives are no longer a tab — they render as a headline
+           under SW4RM. See tab-pane-swarm.) -->
 
       <!-- FL0W, L0GS, and M4TR1X are separate pages reachable from the
            H0M3 hub (served at /), not from the dashboard tab strip — the
@@ -122,9 +112,21 @@
          — the tab label SW4RM already says it. -->
     <section class="tab-pane" id="tab-pane-swarm"
              role="tabpanel" aria-labelledby="tab-swarm">
+      <!-- Swarm / hive identity headline. Populated by refreshState from
+           hive_name + swarm_name; stays hidden when neither is set. -->
+      <h2 id="swarm-identity" hidden></h2>
       <div id="containers-section">
         <p class="meta">loading…</p>
       </div>
+      <!-- Peer hives (federated swarms). The headline block is hidden
+           entirely when nothing is federated; renderPeerHives then drops
+           a quiet "no peer hives configured" note into #peers-section. -->
+      <div id="peers-block" hidden>
+        <h2>◆ P33R H1V3S ◆</h2>
+        <div class="divider">══════════════════════════════════════════════════════════════</div>
+        <p class="meta">peer hives in this swarm. click a card to open that hive's dashboard.</p>
+      </div>
+      <div id="peers-section"></div>
     </section>
 
     <!-- Y3R C4LL: things blocked on operator decision. Approvals +
@@ -221,18 +223,6 @@
       </div>
     </section>
 
-    <!-- P33RS: peer hive link cards. Rendered from state.peer_hives;
-         hidden when the list is empty. -->
-    <section class="tab-pane" id="tab-pane-peers"
-             role="tabpanel" aria-labelledby="tab-peers">
-      <h2>◆ P33R H1V3S ◆</h2>
-      <div class="divider">══════════════════════════════════════════════════════════════</div>
-      <p class="meta">peer hives in this swarm. click a card to open that hive's dashboard.</p>
-      <div id="peers-section">
-        <p class="meta">loading…</p>
-      </div>
-    </section>
-
     <!-- SCH3DUL3S: scheduled prompts. Creation + edit are folded
          into the same table — empty bottom row is the create form
          (fill cells, click ＋), inline-edit-row expands on the `✎`