Port modular features into boursecu and fix desktop login UX.

Add support chat, piggy funds, PWA banner, notification/SSE sync, and messenger legacy guards while keeping boursecu theme; also balance login panels and unblock login navigation.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/utils/priceSocket.ts

@@ -384,6 +384,15 @@ function handleAppNotificationPayload(payload: unknown) {
   void applyAppNotificationFromStream(payload as Record<string, unknown>)
 }
 
+function handleUnreadCountPayload(payload: unknown) {
+  if (!payload || typeof payload !== 'object') {
+    return
+  }
+
+  touchStreamActivity()
+  void applyUnreadCountFromStreamPayload(payload as Record<string, unknown>)
+}
+
 async function applyAppNotificationFromStream(payload: Record<string, unknown>) {
   try {
     const { bumpUnreadFromStream } = await import('@/composables/useAppNotificationBadge')
@@ -393,6 +402,15 @@ async function applyAppNotificationFromStream(payload: Record<string, unknown>)
   }
 }
 
+async function applyUnreadCountFromStreamPayload(payload: Record<string, unknown>) {
+  try {
+    const { applyUnreadCountFromStream } = await import('@/composables/useAppNotificationBadge')
+    applyUnreadCountFromStream(payload)
+  } catch (error) {
+    console.warn('Unread-count SSE apply failed', error)
+  }
+}
+
 function bindStreamEvents(source: EventSource) {
   source.addEventListener('last', (event) => {
     try {
@@ -426,6 +444,14 @@ function bindStreamEvents(source: EventSource) {
     }
   })
 
+  source.addEventListener('unread-count', (event) => {
+    try {
+      handleUnreadCountPayload(JSON.parse(event.data))
+    } catch (error) {
+      console.warn('Unread-count SSE parse failed', error)
+    }
+  })
+
   source.addEventListener('ping', () => {
     touchStreamActivity()
   })