feat: add unified mailbox across accounts and sidebar icons toggle

lib/utils.ts

@@ -1,6 +1,7 @@
 import { type ClassValue, clsx } from "clsx";
 import { twMerge } from "tailwind-merge";
-import { Mailbox } from "./jmap/types";
+import { Mailbox, UNIFIED_MAILBOX_IDS } from "./jmap/types";
+import type { UnifiedMailboxRole } from "./jmap/types";
 import { debug } from "./debug";
 
 export function cn(...inputs: ClassValue[]) {
@@ -380,6 +381,39 @@ export function buildMailboxTree(mailboxes: Mailbox[]): MailboxNode[] {
   return rootMailboxes;
 }
 
+/**
+ * Builds virtual MailboxNode entries for unified mailbox roles with aggregated counts.
+ */
+export function buildUnifiedMailboxNodes(
+  counts: Array<{ role: UnifiedMailboxRole; unreadEmails: number; totalEmails: number }>,
+): MailboxNode[] {
+  return counts.map((count) => ({
+    id: UNIFIED_MAILBOX_IDS[count.role],
+    name: count.role, // Display name is handled by i18n in the component
+    role: count.role,
+    parentId: undefined,
+    sortOrder: 0,
+    totalEmails: count.totalEmails,
+    unreadEmails: count.unreadEmails,
+    totalThreads: 0,
+    unreadThreads: 0,
+    myRights: {
+      mayReadItems: true,
+      mayAddItems: false,
+      mayRemoveItems: false,
+      maySetSeen: true,
+      maySetKeywords: true,
+      mayCreateChild: false,
+      mayRename: false,
+      mayDelete: false,
+      maySubmit: false,
+    },
+    isSubscribed: true,
+    children: [],
+    depth: 0,
+  }));
+}
+
 // Flatten a mailbox tree for rendering with proper depth info
 export function flattenMailboxTree(nodes: MailboxNode[]): MailboxNode[] {
   const result: MailboxNode[] = [];