Restructure web UI navigation into 7 numbered workflow stages

Replace the flat menu (Dashboard, Audit, Validate, Burn, Benchmark,
Tasks, Tools) with a numbered progression that guides engineers through
a logical acceptance workflow:

  Dashboard (landing) → 1. Audit → 2. Check → 3. Load → 4. Speed
  → 5. Endurance → 6. Tools → 7. Settings

Key changes:
- layout.go: numbered nav labels, new hrefs, Tasks removed from nav
  and replaced with a persistent sidebar badge (polls /api/tasks every
  5 s, highlights amber when tasks are active)
- server.go: 301 redirects from /validate→/check, /burn→/load,
  /benchmark→/speed for backward compatibility
- pages.go: dispatch cases for all new routes; old routes kept as
  fallbacks
- page_validate.go: add renderCheck() — non-destructive check page
  with validate-mode tests only (no stress toggle, no targeted-stress/
  targeted-power/pulse cards)
- page_burn.go: add renderLoad() wrapper; update scope alert to
  reference /check instead of /validate
- page_benchmark.go: add renderSpeed() (performance focus) and
  renderEndurance() (stability/overnight focus) wrappers
- page_settings.go: new Settings page with blackbox logging toggle,
  NVIDIA driver reset, and build info
- server_test.go: update five tests to use new route names and
  content expectations

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/webui/layout.go

@@ -68,6 +68,11 @@ tbody tr:hover td{background:rgba(0,0,0,.03)}
 .chip-warn{background:var(--warn-bg);color:var(--warn-fg);border:1px solid #c9ba9b}
 .chip-fail{background:var(--crit-bg);color:var(--crit-fg);border:1px solid var(--crit-border)}
 .chip-unknown{background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}
+/* Tasks nav badge */
+.tasks-nav-btn{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;color:rgba(255,255,255,.55);font-size:12px;text-decoration:none;border-top:1px solid rgba(255,255,255,.12);margin-top:auto;transition:color .15s}
+.tasks-nav-btn:hover{color:#fff}
+.tasks-nav-count{background:var(--accent);color:#fff;border-radius:10px;padding:1px 7px;font-size:11px;font-weight:700;display:none}
+.tasks-nav-count.active{display:inline}
 /* Output terminal */
 .terminal{background:#1b1c1d;border:1px solid rgba(0,0,0,.2);border-radius:4px;padding:14px;font-family:monospace;font-size:12px;color:#b5cea8;max-height:400px;overflow-y:auto;white-space:pre-wrap;word-break:break-all;user-select:text;-webkit-user-select:text}
 .terminal-wrap{position:relative}.terminal-copy{position:absolute;top:6px;right:6px;background:#2d2f30;border:1px solid #444;color:#aaa;font-size:11px;padding:2px 8px;border-radius:3px;cursor:pointer;opacity:.7}.terminal-copy:hover{opacity:1}
@@ -93,14 +98,15 @@ tbody tr:hover td{background:rgba(0,0,0,.03)}
 }
 
 func layoutNav(active string, buildLabel string) string {
-	items := []struct{ id, label, href, onclick string }{
-		{"dashboard", "Dashboard", "/", ""},
-		{"audit", "Audit", "/audit", ""},
-		{"validate", "Validate", "/validate", ""},
-		{"burn", "Burn", "/burn", ""},
-		{"benchmark", "Benchmark", "/benchmark", ""},
-		{"tasks", "Tasks", "/tasks", ""},
-		{"tools", "Tools", "/tools", ""},
+	items := []struct{ id, label, href string }{
+		{"dashboard", "Dashboard", "/"},
+		{"audit", "1. Audit", "/audit"},
+		{"check", "2. Check", "/check"},
+		{"load", "3. Load", "/load"},
+		{"speed", "4. Speed", "/speed"},
+		{"endurance", "5. Endurance", "/endurance"},
+		{"tools", "6. Tools", "/tools"},
+		{"settings", "7. Settings", "/settings"},
 	}
 	var b strings.Builder
 	b.WriteString(`<aside class="sidebar">`)
@@ -124,15 +130,16 @@ func layoutNav(active string, buildLabel string) string {
 		if item.id == active {
 			cls += " active"
 		}
-		if item.onclick != "" {
-			b.WriteString(fmt.Sprintf(`<a class="%s" href="%s" onclick="%s">%s</a>`,
-				cls, item.href, item.onclick, item.label))
-		} else {
-			b.WriteString(fmt.Sprintf(`<a class="%s" href="%s">%s</a>`,
-				cls, item.href, item.label))
-		}
+		b.WriteString(fmt.Sprintf(`<a class="%s" href="%s">%s</a>`, cls, item.href, item.label))
 	}
 	b.WriteString(`</nav>`)
+	b.WriteString(`<a href="/tasks" class="tasks-nav-btn" id="tasks-nav-btn">`)
+	b.WriteString(`<span>Tasks</span>`)
+	b.WriteString(`<span class="tasks-nav-count" id="tasks-nav-count"></span>`)
+	b.WriteString(`</a>`)
+	b.WriteString(`<script>`)
+	b.WriteString(`(function(){function u(){fetch('/api/tasks',{cache:'no-store'}).then(function(r){return r.json();}).then(function(d){var n=Array.isArray(d)?d.filter(function(t){return t.status==='pending'||t.status==='running';}).length:0;var c=document.getElementById('tasks-nav-count');var b=document.getElementById('tasks-nav-btn');if(c){c.textContent=n>0?String(n):'';c.className='tasks-nav-count'+(n>0?' active':'');}if(b){b.style.color=n>0?'#f6c90e':'';}}).catch(function(){});}u();setInterval(u,5000);})();`)
+	b.WriteString(`</script>`)
 	b.WriteString(`</aside>`)
 	return b.String()
 }