fix: show warning if mail manager is missing

Signed-off-by: Sebastian <krupinski01@gmail.com>

src/pages/MailPage.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref, computed, onMounted, watch } from 'vue'
 import { useDisplay } from 'vuetify'
+import { useModuleStore } from '@KTXC/stores/moduleStore'
 import { useCollectionsStore } from '@MailManager/stores/collectionsStore'
 import { useEntitiesStore } from '@MailManager/stores/entitiesStore'
 import { useServicesStore } from '@MailManager/stores/servicesStore'
@@ -17,6 +18,12 @@ import SettingsDialog from '@/components/settings/SettingsDialog.vue'
 // Vuetify display for responsive behavior
 const display = useDisplay()
 
+// Check if mail manager is available
+const moduleStore = useModuleStore()
+const isMailManagerAvailable = computed(() => {
+  return moduleStore.has('mail_manager') || moduleStore.has('MailManager')
+})
+
 // Snackbar state for notifications
 const snackbarVisible = ref(false)
 const snackbarMessage = ref('')
@@ -50,6 +57,8 @@ const isMobile = computed(() => display.mdAndDown.value)
 
 // Initialize
 onMounted(async () => {
+  if (!isMailManagerAvailable.value) return
+
   loading.value = true
   try {
     // Load services (accounts)
@@ -77,6 +86,8 @@ onMounted(async () => {
 watch(
   [selectedFolder, () => servicesStore.services],
   () => {
+    if (!isMailManagerAvailable.value) return
+
     mailSync.clearSources()
 
     // Add currently selected folder to sync
@@ -204,7 +215,28 @@ const currentMessages = computed(() => {
 </script>
 
 <template>
-  <div class="mail-container">
+  <!-- Manager Unavailable -->
+  <div v-if="!isMailManagerAvailable" class="mail-unavailable">
+    <v-alert
+      type="warning"
+      variant="outlined"
+      class="mail-unavailable-alert"
+    >
+      <v-icon size="64" color="warning" class="mb-6">mdi-email-off-outline</v-icon>
+      <h2 class="text-h5 font-weight-bold mb-4">Mail Manager Not Available</h2>
+      <p>
+        The Mail Manager module is not installed or enabled.
+        This module requires the <strong>mail_manager</strong> module to function properly.
+      </p>
+      <p class="mb-0 mt-2">
+        Please contact your system administrator to install and enable the
+        <code>mail_manager</code> module.
+      </p>
+    </v-alert>
+  </div>
+
+  <!-- Normal UI -->
+  <div v-else class="mail-container">
     <!-- Top toolbar -->
     <v-app-bar class="mail-toolbar" elevation="0" density="compact">
       <v-app-bar-nav-icon 
@@ -338,6 +370,22 @@ const currentMessages = computed(() => {
 </template>
 
 <style scoped lang="scss">
+.mail-unavailable {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100vh;
+  padding: 48px;
+  text-align: center;
+  width: 100%;
+}
+
+.mail-unavailable-alert {
+  width: 100%;
+  text-align: left;
+}
+
 .mail-container {
   display: flex;
   flex-direction: column;