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/tabs.js

@@ -2141,13 +2141,18 @@ window.marked = marked;
     selectBase('applied');
   }
 
-  // P33RS tab: render peer hive link cards from state.peer_hives.
-  // Called on every state refresh; hides the tab when the list is empty.
+  // Peer hives: render link cards as a headline section under SW4RM
+  // (state.peer_hives). Called on every state refresh. When nothing is
+  // federated, the "P33R H1V3S" headline block is hidden entirely and a
+  // quiet grey note replaces the cards.
   function renderPeerHives(peers) {
+    const block = $('peers-block');
     const root = $('peers-section');
     if (!root) return;
     root.replaceChildren();
-    if (!peers || !peers.length) {
+    const hasPeers = Array.isArray(peers) && peers.length > 0;
+    if (block) block.hidden = !hasPeers;
+    if (!hasPeers) {
       root.append(el('p', { class: 'empty' }, 'no peer hives configured'));
       return;
     }
@@ -3897,20 +3902,19 @@ window.marked = marked;
       // synchronous read (e.g. the compose autocomplete pulls agent
       // names from here instead of refetching on every keystroke).
       window.__hyperhive_state = s;
-      // Gate the P33RS tab — hidden when no peers are configured.
-      const peersTab = $('tab-peers');
-      const peers = s.peer_hives || [];
-      if (peersTab) peersTab.hidden = peers.length === 0;
-      renderPeerHives(peers);
+      // Peer hives render as a headline section under SW4RM (no longer
+      // a tab); renderPeerHives shows/hides its own headline block.
+      renderPeerHives(s.peer_hives || []);
       renderServerWarnings(s.server_warnings);
       // (The M4TR1X surface is reachable from the H0M3 hub now, not the
       // dashboard tab strip — home.js gates its tile on matrix_gui_enabled.)
-      // Hive identity: update the chrome banner + page title once the
+      // Hive identity: render the swarm/hive name as a headline at the
+      // top of the SW4RM pane + update the page title once the
       // server-side display names are known. `hive_name` / `swarm_name`
       // come from HYPERHIVE_HIVE_NAME / HYPERHIVE_SWARM_NAME env vars
       // (set by services.hyperhive.{hiveName,swarmName} nix options).
-      // When unset we fall back gracefully — no chrome change.
-      const hiveId = $('hive-identity');
+      // When unset we fall back gracefully — the headline stays hidden.
+      const hiveId = $('swarm-identity');
       if (hiveId) {
         const hive = s.hive_name;
         const swarm = s.swarm_name;
@@ -4053,7 +4057,7 @@ window.marked = marked;
   // (`/flow.html`) reached via the tab-strip link. Tab routing only
   // applies when the tab DOM is present (e.g. not on the flow page
   // itself, where these elements don't exist and the loop no-ops).
-  const TABS = ['swarm', 'call', 'system', 'permissions', 'schedules', 'stats', 'peers', 'settings'];
+  const TABS = ['swarm', 'call', 'system', 'permissions', 'schedules', 'stats', 'settings'];
   function activateTab(name) {
     const target = TABS.includes(name) ? name : TABS[0];
     for (const t of TABS) {