feat(mailing-lists): add Aliases count column

Same account-alias-count-column deviation already used on Accounts and
Groups, extended to x:MailingList: adds a synthetic aliasCount column
and lets DynamicList's existing generic column-name-driven handling
resolve/render it — no changes needed there, the mechanism was already
list-agnostic.

Verified in the running dev server: the column renders 0 with no
aliases set on either seeded mailing list.

SCHEMA_DEVIATIONS.md

@@ -69,10 +69,10 @@ itself stays byte-for-byte alignable with upstream's version of the file.
 
 ### `account-alias-count-column` 🟡
 
-- **Where**: [`src/lib/accountColumns.ts`](src/lib/accountColumns.ts), rendering in [`src/components/lists/DynamicList.tsx`](src/components/lists/DynamicList.tsx)
+- **Where**: [`src/lib/accountColumns.ts`](src/lib/accountColumns.ts), [`src/lib/mailingListColumns.ts`](src/lib/mailingListColumns.ts), rendering in [`src/components/lists/DynamicList.tsx`](src/components/lists/DynamicList.tsx)
-- **What**: adds a synthetic `aliasCount` column to the `x:Account/User` and `x:Account/Group` lists — not a real schema property; `DynamicList` resolves it from the real `aliases` objectList property and renders its entry count.
+- **What**: adds a synthetic `aliasCount` column to the `x:Account/User`, `x:Account/Group`, and `x:MailingList` lists — not a real schema property; `DynamicList` resolves it from the real `aliases` objectList property and renders its entry count.
-- **Why**: neither list's schema exposes alias count as a column, only the full `aliases` list on the detail view.
+- **Why**: none of these lists' schemas expose alias count as a column, only the full `aliases` list on the detail view.
-- **Ideal fix**: the server's `x:Account/User` and `x:Account/Group` list schemas include a computed alias-count column natively; this column definition is deleted.
+- **Ideal fix**: the server's list schemas include a computed alias-count column natively; these column definitions are deleted.
 
 ### `account-client-sort` 🟡
 

src/lib/mailingListColumns.ts

@@ -0,0 +1,28 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+import type { Schema } from '@/types/schema';
+
+/**
+ * SCHEMA-DEVIATION: account-alias-count-column (see SCHEMA_DEVIATIONS.md)
+ *
+ * The Mailing Lists list doesn't expose alias count as a column, only the
+ * full `aliases` objectList on the detail view. Adds the same synthetic
+ * `aliasCount` column already used on Accounts/Groups — DynamicList's
+ * generic count-column handling picks it up with no further wiring.
+ */
+export function withMailingListColumns(schema: Schema): Schema {
+  const list = schema.lists['x:MailingList'];
+  if (!list) return schema;
+
+  return {
+    ...schema,
+    lists: {
+      ...schema.lists,
+      'x:MailingList': { ...list, columns: [...list.columns, { name: 'aliasCount', label: 'Aliases' }] },
+    },
+  };
+}

src/pages/AdminPanel.tsx

@@ -14,6 +14,7 @@ import { useUIStore } from '@/stores/uiStore';
 import { fetchSession, fetchSchema, fetchAccountInfo } from '@/services/jmap/client';
 import { withClientLogFilters } from '@/lib/logFilters';
 import { withAccountListColumns } from '@/lib/accountColumns';
+import { withMailingListColumns } from '@/lib/mailingListColumns';
 import { setLocale } from '@/i18n';
 import { TopBar } from '@/components/layout/TopBar';
 import { Sidebar } from '@/components/layout/Sidebar';
@@ -150,7 +151,7 @@ export default function AdminPanel() {
 
         if (cancelled) return;
 
-        setSchema(withAccountListColumns(withClientLogFilters(schemaData)));
+        setSchema(withMailingListColumns(withAccountListColumns(withClientLogFilters(schemaData))));
 
         setAccountInfo(accountData.permissions, accountData.edition, accountData.locale);
         setLocale(accountData.locale);