panel: give Settings, Users, and the session user distinct nav icons

Settings had been sharing the account silhouette with Users and the signed-in user label, so three different concepts read as the same icon. Settings now uses a gear, the user line the single-user icon, and Users a two-person group mark.

Co-Authored-By: Cursor <cursoragent@cursor.com>

CHANGELOG.md

@@ -17,6 +17,9 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); version
 
 ### Changed
 
+- panel: navigation session icons are distinct — **Settings** uses a gear,
+  the signed-in user line carries the single-user icon, and **Users** a
+  two-person group mark instead of the same account silhouette for all three.
 - panel: `/` redirects domain administrators to `/domains`; global users still
   land on `/status`. Navigation hides global-only sections for domain
   administrators.

internal/web/view/static/panel.css

@@ -356,6 +356,9 @@ button.danger:hover, a.danger:hover { background: var(--danger-fill-hover); }
    of them. It may be long and there is nothing to break it on, so it is allowed
    to break mid word rather than widen the column. */
 .nav .session .muted { padding: 0 0.6rem; font-size: 0.85rem; overflow-wrap: anywhere; }
+.nav .session-user {
+  display: flex; align-items: center; gap: 0.5rem;
+}
 /* The mark is a link, but not one of the column's entries: it takes none of the
    padding and rounding the entry rule below applies, so its own edge lines up
    with the entries' icons rather than sitting half a step inside them. */

internal/web/view/templates/layout.html

@@ -75,13 +75,13 @@
     {{if eq .Active "mail_queue"}}<span aria-current="page">{{template "icon-mail-queue"}}Mail queue</span>{{else}}<a href="/mail-queue">{{template "icon-mail-queue"}}Mail queue</a>{{end}}
     {{if eq .Active "system_log"}}<span aria-current="page">{{template "icon-system-log"}}System log</span>{{else}}<a href="/system-log">{{template "icon-system-log"}}System log</a>{{end}}
     {{if eq .Active "backup"}}<span aria-current="page">{{template "icon-backup"}}Backup</span>{{else}}<a href="/backup">{{template "icon-backup"}}Backup</a>{{end}}
-    {{if eq .Active "users"}}<span aria-current="page">{{template "icon-account"}}Users</span>{{else}}<a href="/users">{{template "icon-account"}}Users</a>{{end}}
+    {{if eq .Active "users"}}<span aria-current="page">{{template "icon-users"}}Users</span>{{else}}<a href="/users">{{template "icon-users"}}Users</a>{{end}}
     {{end}}
   </div>
   {{template "sections" .}}
   <div class="session">
-    <span class="muted">User: {{.User}}</span>
+    <span class="session-user muted">{{template "icon-account"}}User: {{.User}}</span>
-    {{if eq .Active "account"}}<span aria-current="page">{{template "icon-account"}}Settings</span>{{else}}<a href="/account">{{template "icon-account"}}Settings</a>{{end}}
+    {{if eq .Active "account"}}<span aria-current="page">{{template "icon-settings"}}Settings</span>{{else}}<a href="/account">{{template "icon-settings"}}Settings</a>{{end}}
     <form class="inline" method="post" action="/logout">
       <button type="submit" class="danger">{{template "icon-sign-out"}}Sign out</button>
     </form>
@@ -122,6 +122,10 @@
      two drawers with handles is the picture of an archive. */}}
 {{define "icon-backup"}}<svg class="icon" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="2.75" y="1.75" width="10.5" height="12.5" rx="1.15"/><path d="M2.75 8h10.5"/><path d="M6.4 4.85h3.2M6.4 11.15h3.2"/></svg>{{end}}
 {{define "icon-account"}}<svg class="icon" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="8" cy="5.4" r="2.75"/><path d="M2.9 14.25a5.1 5.1 0 0 1 10.2 0"/></svg>{{end}}
+{{/* Two silhouettes, the nearer one drawn last so it reads in front — the
+     picture of a group rather than a single account. */}}
+{{define "icon-users"}}<svg class="icon" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="10.75" cy="5" r="2.15"/><path d="M7.35 13.85a4.2 4.2 0 0 1 6.8 0"/><circle cx="5.25" cy="5.35" r="2.5"/><path d="M1.35 14.25a4.9 4.9 0 0 1 7.8 0"/></svg>{{end}}
+{{define "icon-settings"}}<svg class="icon" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="8" cy="8" r="2"/><path d="M8 1.75v1.65M8 12.6v1.65M1.75 8h1.65M12.6 8h1.65M3.52 3.52l1.17 1.17M11.31 11.31l1.17 1.17M3.52 12.48l1.17-1.17M11.31 4.69l1.17-1.17"/></svg>{{end}}
 {{/* Sign out is the one icon here that marks an action rather than a page: an
      open door with the arrow leading out of it. */}}
 {{define "icon-sign-out"}}<svg class="icon" viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M6.1 14.25H3.65a1.15 1.15 0 0 1-1.15-1.15V2.9a1.15 1.15 0 0 1 1.15-1.15H6.1"/><path d="M10.6 11.15 13.75 8 10.6 4.85"/><path d="M13.75 8H6.35"/></svg>{{end}}