feat(02-01): add /mobile/analyzer placeholder so Analyzer tab does not 404

- Minimal server component with coming soon card
- No data fetching — Phase 6 (ANL-01..06) owns the real implementation
- Sparkles icon consistent with BottomNav tab icon
- Resolves NAV-02: Analyzer tab in bottom nav has a valid route

app/mobile/analyzer/page.tsx

@@ -0,0 +1,33 @@
+/* Placeholder for /mobile/analyzer.
+ *
+ * Phase 02 only adds the Analyzer tab to the bottom nav — the real feed
+ * lands in Phase 6 (`docs/superpowers/specs/2026-05-03-mobile-shell-design.md`
+ * §6.4). This file exists so tapping the Analyzer tab resolves to a real
+ * route instead of 404. Phase 6 will replace this file with the actual
+ * read-only feed page.
+ *
+ * DO NOT add features, data fetching, or UI beyond the "Coming soon"
+ * card here — Phase 6 owns the real implementation. */
+
+import { Sparkles } from 'lucide-react';
+
+export const metadata = {
+  title: 'Analyzer · Pulse',
+};
+
+export default function MobileAnalyzerPlaceholder() {
+  return (
+    <div className="p-4">
+      <div className="rounded-2xl border bg-card p-6 flex flex-col items-center text-center gap-3">
+        <div className="h-12 w-12 rounded-2xl bg-primary/10 text-primary flex items-center justify-center">
+          <Sparkles className="h-6 w-6" />
+        </div>
+        <h1 className="text-lg font-semibold">Analyzer feed coming soon</h1>
+        <p className="text-sm text-muted-foreground max-w-xs">
+          The mobile Analyzer feed is on its way. Until then, view full
+          analyses on the desktop Analyzer.
+        </p>
+      </div>
+    </div>
+  );
+}