Feat: Agregar sistema de alias para chats

- Agregar campo alias a tabla chats con migración 003
- Crear endpoint PUT /api/messages/:instanceId/:chatId/alias
- Modificar MCP para priorizar alias sobre nombres automáticos
- Crear modal ChatAliasModal para editar alias desde UI
- Agregar botón de editar alias en ChatItem
- Integrar modal en página de mensajes

El alias permite asignar nombres personalizados a chats que tienen
prioridad sobre los nombres de WhatsApp tanto en la interfaz como
en el MCP para agentes IA.

server/api/messages/[instanceId]/[chatId]/alias.put.ts

@@ -0,0 +1,68 @@
+/**
+ * PUT /api/messages/:instanceId/:chatId/alias
+ * Update the alias of a chat
+ */
+import { query } from '../../../../utils/database'
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const instanceId = getRouterParam(event, 'instanceId')
+  const chatId = getRouterParam(event, 'chatId')
+
+  if (!instanceId) {
+    throw createError({ statusCode: 400, message: 'Missing instanceId' })
+  }
+
+  if (!chatId) {
+    throw createError({ statusCode: 400, message: 'Missing chatId' })
+  }
+
+  const body = await readBody<{ alias: string | null }>(event)
+
+  // alias can be null to remove it, or a string to set it
+  if (body?.alias === undefined) {
+    throw createError({ statusCode: 400, message: 'Missing alias in request body' })
+  }
+
+  try {
+    // Update the alias
+    const result = await query(
+      `UPDATE chats
+       SET alias = $1, updated_at = NOW()
+       WHERE id = $2 AND instance_id = $3
+       RETURNING id, jid, name, alias, is_group`,
+      [body.alias || null, chatId, instanceId]
+    )
+
+    if (result.rows.length === 0) {
+      throw createError({ statusCode: 404, message: 'Chat not found' })
+    }
+
+    const chat = result.rows[0]
+    return {
+      success: true,
+      chat: {
+        id: chat.id,
+        jid: chat.jid,
+        name: chat.name,
+        alias: chat.alias,
+        isGroup: chat.is_group
+      }
+    }
+  } catch (error: any) {
+    console.error('[Alias API] Error updating alias:', error)
+
+    if (error.statusCode) {
+      throw error
+    }
+
+    throw createError({
+      statusCode: 500,
+      message: error.message || 'Error updating alias'
+    })
+  }
+})

server/database/migrations/003_add_alias.sql

@@ -0,0 +1,12 @@
+-- =====================================================
+-- Migration 003: Add alias field to chats
+-- =====================================================
+-- Allows users to assign custom names (aliases) to chats
+-- Alias takes priority over automatic names from WhatsApp
+-- =====================================================
+
+-- Add alias column to chats table
+ALTER TABLE chats ADD COLUMN IF NOT EXISTS alias VARCHAR(255);
+
+-- Add index for alias searches (partial index for non-null values)
+CREATE INDEX IF NOT EXISTS idx_chats_alias ON chats(alias) WHERE alias IS NOT NULL;

server/utils/mcp.ts

@@ -688,10 +688,10 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
 
         const result = await query(
           `SELECT
-             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at, c.last_message_type,
+             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at, c.last_message_type, c.alias,
              CASE
-               WHEN c.is_group THEN COALESCE(gm.subject, c.name, c.jid)
-               ELSE COALESCE(ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
+               WHEN c.is_group THEN COALESCE(c.alias, gm.subject, c.name, c.jid)
+               ELSE COALESCE(c.alias, ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
              END as name
            FROM chats c
            LEFT JOIN contacts ct ON c.instance_id = ct.instance_id AND c.jid = ct.jid
@@ -708,6 +708,7 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
             id: row.id,
             jid: row.jid,
             name: row.name,
+            alias: row.alias,
             isGroup: row.is_group,
             unreadCount: row.unread_count || 0,
             lastMessageAt: row.last_message_at,
@@ -725,10 +726,10 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
 
         const result = await query(
           `SELECT
-             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at, c.last_message_type,
+             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at, c.last_message_type, c.alias,
              CASE
-               WHEN c.is_group THEN COALESCE(gm.subject, c.name, c.jid)
-               ELSE COALESCE(ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
+               WHEN c.is_group THEN COALESCE(c.alias, gm.subject, c.name, c.jid)
+               ELSE COALESCE(c.alias, ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
              END as name,
              gm.participants as group_participants
            FROM chats c
@@ -747,6 +748,7 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
           id: chat.id,
           jid: chat.jid,
           name: chat.name,
+          alias: chat.alias,
           isGroup: chat.is_group,
           unreadCount: chat.unread_count || 0,
           lastMessageAt: chat.last_message_at,
@@ -773,16 +775,16 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
 
         const result = await query(
           `SELECT
-             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at,
+             c.id, c.jid, c.is_group, c.unread_count, c.last_message_at, c.alias,
              CASE
-               WHEN c.is_group THEN COALESCE(gm.subject, c.name, c.jid)
-               ELSE COALESCE(ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
+               WHEN c.is_group THEN COALESCE(c.alias, gm.subject, c.name, c.jid)
+               ELSE COALESCE(c.alias, ct.name, ct.push_name, c.name, SPLIT_PART(c.jid, '@', 1))
              END as name
            FROM chats c
            LEFT JOIN contacts ct ON c.instance_id = ct.instance_id AND c.jid = ct.jid
            LEFT JOIN group_metadata gm ON c.instance_id = gm.instance_id AND c.jid = gm.jid
            WHERE c.instance_id = $1
-             AND (c.name ILIKE $2 OR c.jid ILIKE $2 OR ct.name ILIKE $2 OR ct.push_name ILIKE $2 OR gm.subject ILIKE $2)
+             AND (c.alias ILIKE $2 OR c.name ILIKE $2 OR c.jid ILIKE $2 OR ct.name ILIKE $2 OR ct.push_name ILIKE $2 OR gm.subject ILIKE $2)
            ORDER BY c.last_message_at DESC NULLS LAST
            LIMIT $3`,
           [instanceId, `%${searchQuery}%`, Math.min(limit, 50)]
@@ -794,6 +796,7 @@ export async function handleToolCall(toolName: string, args: Record<string, any>
             id: row.id,
             jid: row.jid,
             name: row.name,
+            alias: row.alias,
             isGroup: row.is_group,
             unreadCount: row.unread_count || 0,
             lastMessageAt: row.last_message_at