feat(admin): add Compose and Settings tabs to Harvest Reach communications

- Add Compose tab that displays CampaignComposerPage with 4-step wizard
- Add Settings tab linking to existing /admin/communications/settings
- Complete the 8-tab navigation structure for Harvest Reach module

Tabs: Campaigns, Compose, Segments, Analytics, Templates, Contacts, Logs, Settings

src/components/admin/CommunicationsNav.tsx

@@ -8,6 +8,7 @@ const TABS = [
   { id: "templates", label: "Templates" },
   { id: "contacts", label: "Contacts" },
   { id: "logs", label: "Logs" },
+  { id: "settings", label: "Settings" },
 ];
 
 // Icon components
@@ -81,7 +82,7 @@ const Icons = {
 export default function CommunicationsNav({
   activeTab,
 }: {
-  activeTab: "campaigns" | "templates" | "contacts" | "logs" | "segments" | "analytics" | "compose";
+  activeTab: "campaigns" | "templates" | "contacts" | "logs" | "segments" | "analytics" | "compose" | "settings";
 }) {
   return (
     <nav className="grid grid-cols-4 sm:grid-cols-7 gap-1 p-1.5 rounded-xl bg-white border border-stone-200">
@@ -104,6 +105,7 @@ export default function CommunicationsNav({
             {tab.id === "templates" && Icons.fileText("h-3.5 w-3.5 sm:h-4 sm:w-4")}
             {tab.id === "contacts" && Icons.userCheck("h-3.5 w-3.5 sm:h-4 sm:w-4")}
             {tab.id === "logs" && Icons.list("h-3.5 w-3.5 sm:h-4 sm:w-4")}
+            {tab.id === "settings" && Icons.settings("h-3.5 w-3.5 sm:h-4 sm:w-4")}
             <span>{tab.label}</span>
             {isActive && (
               <div className="absolute bottom-1 sm:bottom-1.5 left-1/2 -translate-x-1/2 h-0.5 w-4 sm:w-8 bg-white rounded-full" />

src/components/admin/CommunicationsPage.tsx

@@ -16,7 +16,14 @@ import type { Contact } from "@/actions/communications/contacts";
 import type { Segment } from "@/actions/harvest-reach/segments";
 import type { CampaignAnalytics } from "@/actions/harvest-reach/campaigns";
 
-type Tab = "campaigns" | "templates" | "contacts" | "segments" | "logs" | "analytics";
+type Tab = "campaigns" | "compose" | "templates" | "contacts" | "segments" | "logs" | "analytics";
+
+const ComposeIcon = () => (
+  <svg className="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <path d="M4 4h16c1.1 0 2 .9 2 2v12c0 1.1-.9 2-2 2H4c-1.1 0-2-.9-2-2V6c0-1.1.9-2 2-2z"/>
+    <polyline points="22,6 12,13 2,6"/>
+  </svg>
+);
 
 const MailIcon = () => (
   <svg className="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
@@ -119,6 +126,7 @@ export default function CommunicationsPage({
             }}
             tabs={[
               { value: "campaigns", label: "Campaigns", icon: <MailIcon /> },
+              { value: "compose", label: "Compose", icon: <ComposeIcon /> },
               { value: "templates", label: "Templates", icon: <FileTextIcon /> },
               { value: "contacts", label: "Contacts", icon: <UsersIcon /> },
               { value: "segments", label: "Segments", icon: <LayersIcon /> },
@@ -198,8 +206,20 @@ export default function CommunicationsPage({
           </div>
         )}
 
-        {/* Compose Mode */}
-        {(isComposing || editCampaignId) && (
+        {/* Compose Tab */}
+        {currentTab === "compose" && (
+          <div className="rounded-2xl border border-[var(--admin-border)] bg-white">
+            <CampaignComposerPage
+              brandId={brandId}
+              campaigns={campaigns}
+              templates={templates}
+              segments={initialSegments}
+            />
+          </div>
+        )}
+
+        {/* Legacy Compose Mode (from edit mode) */}
+        {(isComposing || editCampaignId) && currentTab === "campaigns" && (
           <div className="rounded-2xl border border-[var(--admin-border)] bg-white">
             <CampaignComposerPage
               brandId={brandId}