refactor(dashboard): drop FL0W/L0GS/M4TR1X page-links from the tab strip (#1464)

Follow-up to the route swap (#1501): now that every separate page is
reachable from the H0M3 hub, the dashboard tab strip should hold only
real in-page tabs, not the "→" links out to other pages (mara: "remove
links to the pages from dashboard - only actual tabs stay here").

- dashboard.html: remove the `tab-matrix`, `tab-flow`, and `tab-logs`
  `.tab-link` entries (and the stale `tab-count-flow` pill slot — the
  operator inbox moved to Y3R C4LL). The dashboard strip is now SW4RM /
  Y3R C4LL / SYST3M / P3RM1SS10NS / SCH3DUL3S / P33RS / ST4TS / S3TT1NGS.
- tabs.js: drop the now-dead `tab-matrix` matrix_gui_enabled gate (the
  H0M3 Matrix tile is gated by home.js instead) and the obsolete
  `#tab-count-flow` comment. Kept the contextual deep-links into the log
  viewer (an agent's logs, a build entry's log) — those are functional
  content links, not navigation chrome.
- flow.css: remove the dead `.dashboard-chrome.flow-chrome` +
  `.tabbar .tab.active.tab-link` rules — the flow page uses a slim
  back-link header, not the dashboard tabbar, and `.tab-link` no longer
  exists anywhere.

npm run build green (flow.css 1.8kb). No residual references.

frontend/packages/dashboard/src/dashboard.html

@@ -81,40 +81,15 @@
         <span class="tab-count" id="tab-count-peers" hidden></span>
       </a>
 
-      <!-- M4TR1X: optional matrix web client (fluffychat-web by
-           default) mounted at /matrix/ by the gateway when
-           `hyperhive.matrix.gui.enable = true`. Same-origin
-           navigation (the static dist is its own SPA). Hidden in
-           JS when `state.matrix_gui_enabled === false` so operators
-           without matrix-gui on don't see a dead link. See
-           docs/web-ui.md::Tab strip for the gating model and
-           docs/gateway.md for the matrix vhost + .well-known
-           auto-discovery. -->
-      <a class="tab tab-link" id="tab-matrix" href="/matrix/" hidden
-         title="open the matrix chat client (fluffychat-web)">
-        <span class="tab-label">◆ M4TR1X ◆ →</span>
-      </a>
+      <!-- FL0W, L0GS, and M4TR1X are separate pages reachable from the
+           H0M3 hub (served at /), not from the dashboard tab strip — the
+           strip holds only real in-page tabs now. Contextual deep-links
+           into the log viewer (an agent's logs, a build entry's log)
+           still live inside the relevant dashboard content. -->
 
-      <!-- FL0W is its own page (`/flow.html`), not a tab. The link
-           lives in the tab strip so it reads as a peer surface;
-           clicking navigates rather than swapping panes in place.
-           Count pill mirrors the dashboard's operator-inbox length
-           and is hidden when zero. See docs/web-ui.md::FL0W page. -->
-      <a class="tab tab-link" id="tab-flow" href="/flow.html"
-         title="open the all-agents chat in a dedicated full-page terminal">
-        <span class="tab-label">◆ FL0W ◆ →</span>
-        <span class="tab-count" id="tab-count-flow" hidden></span>
-      </a>
-
-      <!-- L0GS and S3TT1NGS: default-overflow — always live in the ⋮
-           dropdown, never in the main strip. `data-overflow="default"`
-           marks them so JS keeps them out of the bar regardless of
-           available width. -->
-      <a class="tab tab-link" id="tab-logs" href="/logs.html"
-         data-overflow="default"
-         title="open the log viewer">
-        <span class="tab-label">◆ L0GS ◆ →</span>
-      </a>
+      <!-- S3TT1NGS: default-overflow — always lives in the ⋮ dropdown,
+           never in the main strip. `data-overflow="default"` marks it so
+           JS keeps it out of the bar regardless of available width. -->
       <a class="tab" id="tab-settings" href="#settings" role="tab"
          aria-controls="tab-pane-settings"
          data-tab="settings"

frontend/packages/dashboard/src/flow.css

@@ -4,8 +4,8 @@
    composer, full-viewport terminal). */
 
 :root {
-  /* Approximate height of the flow chrome (tabbar + dashboard-chrome
-     padding). The slug banner lives at the page footer on /, omitted
+  /* Approximate height of the flow chrome (the slim back-link header).
+     The slug banner lives at the page footer on the dashboard, omitted
      on /flow.html since the full-viewport terminal has no normal-flow
      footer position. */
   --flow-header-h: 3.6em;
@@ -29,35 +29,6 @@ body.flow-shell {
     var(--bg);
 }
 
-/* Flow chrome reuses the dashboard's `.dashboard-chrome` + tabbar
-   so the operator can switch tabs from the flow page without
-   navigating back first. The chrome must be fixed-position (vs
-   sticky on the dashboard) since flow-shell has `overflow: hidden`
-   on body and the main area absolute-positions the terminal. */
-body.flow-shell .dashboard-chrome.flow-chrome {
-  position: fixed;
-  top: 0;
-  left: 0;
-  right: 0;
-  z-index: 30;
-  margin: 0;
-  padding: 0.4em 0 0;
-  background: var(--flow-frost-bg);
-  -webkit-backdrop-filter: var(--flow-frost-blur);
-  backdrop-filter: var(--flow-frost-blur);
-  border-bottom: 1px solid var(--purple-dim);
-  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
-}
-/* Active tab on the flow page is FL0W. Its `.tab-link` styling (the
-   tab strip's right-most entry on the dashboard, where it represents
-   the *link out* to /flow.html) needs to read as the active tab here.
-   `aria-current="page"` flags it semantically. */
-body.flow-shell .tabbar .tab.active.tab-link {
-  color: var(--purple);
-  background: var(--bg);
-  border-color: var(--purple-dim);
-  box-shadow: 0 -2px 12px -4px rgba(203, 166, 247, 0.4);
-}
 .flow-main {
   position: absolute;
   top: 0;

frontend/packages/dashboard/src/tabs.js

@@ -3901,10 +3901,8 @@ window.marked = marked;
       const peers = s.peer_hives || [];
       if (peersTab) peersTab.hidden = peers.length === 0;
       renderPeerHives(peers);
-      // Gate the M4TR1X → tab strip entry — see
-      // docs/web-ui.md::Tab strip for the matrix_gui_enabled rationale.
-      const matrixTab = $('tab-matrix');
-      if (matrixTab) matrixTab.hidden = !s.matrix_gui_enabled;
+      // (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
       // server-side display names are known. `hive_name` / `swarm_name`
       // come from HYPERHIVE_HIVE_NAME / HYPERHIVE_SWARM_NAME env vars
@@ -4604,11 +4602,6 @@ window.marked = marked;
     // target (whole-schedule cancellation or all-targets-cancelled
     // means "not waiting on the worker"; those don't pull attention).
     setTabCount('schedules', activeScheduleCount());
-    // FL0W pill count: lives in ./flow.js now (it has the inbox
-    // derived store). Dashboard tab strip's `#tab-count-flow` slot
-    // stays hidden by default; future plumbing could broadcast the
-    // count via localStorage / BroadcastChannel if both pages are
-    // open.
 
     // Re-render overflow dropdown so badges stay in sync.
     updateTabbarOverflow();
@@ -4620,6 +4613,6 @@ window.marked = marked;
   refreshTabCounts();
   setInterval(refreshTabCounts, 1000);
 
-  // Flow-specific code (inbox-pill wiring, broker terminal init, the
-  // @-mention composer) lives in ./flow.js — loaded only by /flow.html.
+  // Flow-specific code (broker terminal init + the @-mention composer)
+  // lives in ./flow.js — loaded only by /flow.html.
 })();