chore(frontend): scrub pre-existing issue-tag refs from source comments

The no-issue-tags-in-code rule (knowledge/hive-rules.md) was enforced on
recent PRs but several pre-existing parenthetical refs remained in the
frontend source. Replace them with plain prose — issue numbers are opaque
in source, and prose survives repo migrations + doesn't confuse static
analysis. Comment-only; no behaviour change.

- tabs.js: 4× operator-inbox refs → prose
- flow.js / flow.css: agent-filter + sent/delivered-collapse refs → prose
- home.js / home.css: H0M3 page-script + page-chrome refs → prose
- dashboard.html: 1NB0X inbox ref → prose

Closes #1549.

frontend/packages/dashboard/src/dashboard.html

@@ -118,7 +118,7 @@
          can decide without leaving the pane. -->
     <section class="tab-pane" id="tab-pane-call" data-tab-pane="call" hidden
              role="tabpanel" aria-labelledby="tab-call">
-      <!-- 1NB0X: unread agent→operator messages (#1469). Fetched on
+      <!-- 1NB0X: unread agent→operator messages. Fetched on
            tab activation + cold load, appended live from the broker
            stream, cleared via "mark all read". Count folds into the
            Y3R C4LL pill so messages aren't missed. -->

frontend/packages/dashboard/src/flow.css

@@ -88,7 +88,7 @@ body.flow-shell .flow-main-slim {
   padding: 0.4em 1em;
 }
 
-/* Agent filter (#1473): a select in the FL0W header narrows the
+/* Agent filter: a select in the FL0W header narrows the
    timeline to messages involving one agent. Non-matching rows get
    `.flow-hidden`; the select reuses the journal-unit control look. */
 .flow-filter {

frontend/packages/dashboard/src/flow.js

@@ -36,7 +36,7 @@ import {
     populateAgentFilter();
   }).catch(() => { /* graceful: compose just shows `*` and nothing else */ });
 
-  // ─── agent filter (#1473) ───────────────────────────────────────────────
+  // ─── agent filter ───────────────────────────────────────────────
   // A select in the FL0W header narrows the timeline to messages involving
   // one agent (matched on `from` OR `to`). Each rendered row carries
   // `data-from` / `data-to`; non-matching rows get `.flow-hidden`. New rows
@@ -158,7 +158,7 @@ import {
       } else {
         row.append(ts, ' ', arrow, ' ', from, ' ', sep, ' ', to, ' ', body);
       }
-      // Tag with the participants so the agent filter (#1473) can match
+      // Tag with the participants so the agent filter can match
       // on `from`/`to`, and hide the row up-front if a filter is active.
       row.dataset.from = ev.from;
       row.dataset.to = ev.to;
@@ -168,7 +168,7 @@ import {
       return row;
     }
 
-    // Sent→Delivered collapse (#1472). When a message directly wakes its
+    // Sent→Delivered collapse. When a message directly wakes its
     // recipient the broker emits `sent` then `delivered` for the same row
     // id back-to-back, rendering two near-identical lines. We track each
     // recent `sent` row and, when its `delivered` lands within

frontend/packages/dashboard/src/home.css

@@ -1,7 +1,7 @@
-/* H0M3 — the menu-hub page (#1464). Minimal portal styling: a banner
+/* H0M3 — the menu-hub page. Minimal portal styling: a banner
    + a responsive grid of link tiles. Colours come from theme.css (the
    shared palette); base typography from common.css. When the shared
-   page-chrome component lands (#1464 phase 2 / #1451) the banner + tile
+   page-chrome component lands (a later refactor step) the banner + tile
    styling can fold into it. */
 
 body.home-shell {

frontend/packages/dashboard/src/home.js

@@ -1,4 +1,4 @@
-// H0M3 page script (#1464). The page is static markup; this only does
+// H0M3 page script. The page is static markup; this only does
 // a few small things off a single `/api/state` read:
 //   1. reveal the Matrix tile when the matrix GUI is enabled (same
 //      gating as the dashboard's M4TR1X tab — no dead link otherwise);

frontend/packages/dashboard/src/tabs.js

@@ -3975,7 +3975,7 @@ window.marked = marked;
     }
   }
   refreshState();
-  // Cold-load the operator inbox (#1469) so the Y3R C4LL pill + browser
+  // Cold-load the operator inbox so the Y3R C4LL pill + browser
   // title reflect unread agent→operator messages immediately, before the
   // operator opens the tab. Live updates arrive via the broker stream.
   refreshOperatorInbox();
@@ -4030,7 +4030,7 @@ window.marked = marked;
       let ev;
       try { ev = JSON.parse(e.data); } catch { return; }
       // Broker `sent` frames aren't mutation events, but the operator
-      // inbox (#1469) cares about ones addressed to "operator".
+      // inbox cares about ones addressed to "operator".
       if (ev.kind === 'sent' && ev.to === 'operator') {
         operatorInboxAppendFromEvent(ev);
         return;
@@ -4201,7 +4201,7 @@ window.marked = marked;
   // stores so SSE-driven updates flow through without extra plumbing.
   // Set `hidden` when the count is zero so the pill doesn't draw
   // attention to an empty room.
-  // ─── operator inbox (#1469) — unread agent→operator messages ────────────
+  // ─── operator inbox — unread agent→operator messages ────────────
   // The Y3R C4LL tab surfaces messages agents `send(to: "operator")` so
   // the operator stops missing them. Unread = broker rows to "operator"
   // with `acked_at IS NULL`; cold-loaded from `/api/operator-inbox`,
@@ -4285,7 +4285,7 @@ window.marked = marked;
     }
     setTabCount('swarm', swarm);
     // Y3R C4LL — pending approvals + operator-targeted questions +
-    // unread agent→operator messages (#1469).
+    // unread agent→operator messages.
     const callCount =
       (approvalsState?.pending?.length ?? 0) +
       (questionsState?.pending?.length ?? 0) +