CRITICAL FIX: Remove deprecated 'app' prop to enable sidebar collapse

- Removed 'app' prop from v-navigation-drawer in all layouts
- Removed 'app' prop from v-app-bar in all layouts
- The 'app' prop is deprecated in Vuetify 3 and was preventing rail mode
- This was the root cause of sidebar not collapsing

Vuetify 3 automatically handles layout participation without the app prop.
The presence of this deprecated prop was causing Vuetify to ignore the
rail prop entirely, preventing the sidebar from collapsing.

layouts/admin.vue

@@ -2,7 +2,6 @@
   <v-app>
     <v-navigation-drawer 
       v-model="drawer" 
-      app 
       :rail="miniVariant"
       :expand-on-hover="false"
       permanent
@@ -285,7 +284,7 @@
       </template>
     </v-navigation-drawer>
     
-    <v-app-bar app elevation="0" flat class="glass-app-bar admin-bar">
+    <v-app-bar elevation="0" flat class="glass-app-bar admin-bar">
       <v-btn
         icon
         @click="toggleDrawer"

layouts/board.vue

@@ -2,7 +2,6 @@
   <v-app>
     <v-navigation-drawer 
       v-model="drawer" 
-      app 
       :rail="miniVariant"
       :expand-on-hover="false"
       permanent
@@ -218,7 +217,7 @@
       </template>
     </v-navigation-drawer>
     
-    <v-app-bar app elevation="0" flat class="glass-app-bar board-bar">
+    <v-app-bar elevation="0" flat class="glass-app-bar board-bar">
       <v-btn
         icon
         @click="toggleDrawer"

layouts/member.vue

@@ -2,7 +2,6 @@
   <v-app>
     <v-navigation-drawer 
       v-model="drawer" 
-      app 
       :rail="miniVariant"
       :expand-on-hover="false"
       permanent
@@ -114,7 +113,7 @@
       </template>
     </v-navigation-drawer>
     
-    <v-app-bar app elevation="0" flat class="glass-app-bar member-bar">
+    <v-app-bar elevation="0" flat class="glass-app-bar member-bar">
       <v-btn
         icon
         @click="toggleDrawer"