feat: campana multi-módulo estilo inventario

frontend/src/app/(app)/layout.tsx

@@ -3,6 +3,7 @@
 import { useState } from "react";
 import { useAuth } from "@/lib/auth";
 import Sidebar from "@/components/Sidebar";
+import NotificationBell from "@/components/NotificationBell";
 import { useRouter } from "next/navigation";
 import { useEffect } from "react";
 
@@ -60,10 +61,7 @@ function AppShell({ children }: { children: React.ReactNode }) {
           </div>
 
           <div className="d-flex align-items-center gap-3 ms-auto">
-            <button className="notification-btn">
-              <i className="bi bi-bell"></i>
-              <span className="notification-badge">3</span>
-            </button>
+            <NotificationBell />
 
             <TopNavbarUser />
           </div>

frontend/src/app/globals.css

@@ -208,18 +208,169 @@ body {
   position: absolute;
   top: 2px;
   right: 2px;
-  width: 18px;
+  min-width: 18px;
   height: 18px;
+  padding: 0 4px;
   background: #dc3545;
   color: #fff;
   font-size: 0.65rem;
-  border-radius: 50%;
+  border-radius: 9px;
   display: flex;
   align-items: center;
   justify-content: center;
   font-weight: 600;
 }
 
+.notification-panel {
+  width: 380px;
+  max-width: calc(100vw - 2rem);
+  padding: 0;
+  overflow: hidden;
+  border: 1px solid rgba(22, 36, 61, 0.1);
+  border-radius: 14px;
+  box-shadow: 0 0.6rem 1.4rem rgba(22, 36, 61, 0.12);
+}
+
+.notification-hero {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.75rem;
+  padding: 0.8rem 1rem;
+  color: #fff;
+  background: linear-gradient(135deg, #16243d 0%, #015fc9 100%);
+}
+
+.notification-eyebrow {
+  display: block;
+  margin-bottom: 0.15rem;
+  color: rgba(255, 255, 255, 0.7);
+  font-size: 0.62rem;
+  font-weight: 700;
+  letter-spacing: 0.1em;
+  text-transform: uppercase;
+}
+
+.notification-hero strong {
+  font-size: 0.95rem;
+}
+
+.notification-markall {
+  flex-shrink: 0;
+  color: #fff;
+  border: 1px solid rgba(255, 255, 255, 0.35);
+  border-radius: 10px;
+  font-size: 0.75rem;
+}
+
+.notification-markall:hover:not(:disabled) {
+  color: #fff;
+  background: rgba(255, 255, 255, 0.14);
+}
+
+.notification-markall:disabled {
+  color: rgba(255, 255, 255, 0.55);
+  border-color: rgba(255, 255, 255, 0.2);
+}
+
+.notification-filters {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.4rem;
+  padding: 0.6rem 1rem;
+  border-bottom: 1px solid #edf1f6;
+  background: #fbfcfe;
+}
+
+.notification-pill {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+  border: 1px solid #dfe8f2;
+  border-radius: 999px;
+  background: #fff;
+  color: #42506b;
+  font-size: 0.72rem;
+  font-weight: 600;
+  padding: 0.28em 0.7em;
+}
+
+.notification-pill.active {
+  background: #16243d;
+  border-color: #16243d;
+  color: #fff;
+}
+
+.notification-list {
+  max-height: 380px;
+  overflow-y: auto;
+}
+
+.notification-item {
+  display: flex;
+  gap: 0.5rem;
+  width: 100%;
+  text-align: left;
+  background: none;
+  border: none;
+  border-bottom: 1px solid #edf1f6;
+  border-left: 4px solid transparent;
+  padding: 0.65rem 1rem;
+}
+
+.notification-item:last-child {
+  border-bottom: none;
+}
+
+.notification-item:hover {
+  background-color: #f0f6ff;
+}
+
+.notification-item.unread {
+  background-color: #e7f2ff;
+}
+
+.notification-text {
+  flex-grow: 1;
+  min-width: 0;
+}
+
+.notification-module {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+  font-size: 0.65rem;
+  font-weight: 700;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  border-radius: 6px;
+  padding: 0.15em 0.5em;
+  margin-bottom: 0.25rem;
+}
+
+.notification-title {
+  font-size: 0.85rem;
+  font-weight: 600;
+  line-height: 1.3;
+}
+
+.notification-body {
+  font-size: 0.8rem;
+  color: var(--text-muted);
+  line-height: 1.35;
+  margin-top: 2px;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+.notification-time {
+  font-size: 0.72rem;
+  color: var(--text-muted);
+  margin-top: 2px;
+}
+
 /* Main Content */
 .main-content {
   margin-left: var(--sidebar-width);