Fix desktop responsive layout: sidebar, content sizing, remove duplicate tab bar

- Replace uni-app custom-tab-bar with manual NavBar component in App.vue
  (uni-app auto-detection was not including component in build)
- Mobile: NavBar hidden via CSS display:none, uni-app default tab bar handles nav
- Desktop: NavBar visible as 220px left sidebar, uni-app tab bar hidden
- Content area: max-width 1200px with margin-left:220px, centered
- Buttons/inputs/cards: global desktop CSS overrides for reasonable sizing
- Clean approach: NavBar always in DOM, CSS media queries control visibility
  (no v-if, no conflicting !important)

uni-app/src/App.vue

@@ -1,8 +1,12 @@
 <template>
-  <router-view />
+  <div class="app-wrapper">
+    <NavBar />
+    <router-view />
+  </div>
 </template>
 
 <script setup>
+import NavBar from './components/nav-bar.vue'
 </script>
 
 <style>
@@ -18,7 +22,7 @@ html, body, #app {
   width: 100%;
 }
 
-/* Let uni-app framework manage layout for native tabbar */
+/* Let uni-app pages scroll */
 uni-page {
   overflow-y: auto !important;
 }
@@ -29,12 +33,22 @@ uni-page-body {
 
 /* ===== Desktop responsive (≥1024px) ===== */
 @media (min-width: 1024px) {
+  /* Hide the built-in uni-app tab bar on desktop */
+  uni-tabbar {
+    display: none !important;
+  }
+
   /* Sidebar — shift page content right */
   uni-page-body {
     margin-left: 220px !important;
     font-size: 16px !important;
   }
 
+  /* Remove the tab-bar-height bottom padding that uni-app adds for tab pages */
+  .uni-app--showtabbar uni-page-wrapper:after {
+    display: none !important;
+  }
+
   /* Constrain + center page content */
   uni-page-body > view {
     max-width: 1200px !important;
@@ -49,7 +63,26 @@ uni-page-body {
     border-radius: 20px !important;
   }
 
-  /* Fix floating AI assistant (clear sidebar + reasonable position) */
+  /* Buttons: reasonable desktop sizing */
+  uni-page-body button,
+  uni-page-body .btn-primary,
+  uni-page-body .btn-secondary,
+  uni-page-body .uni-btn,
+  uni-page-body [class*="btn-"] {
+    min-width: 120px;
+    padding: 12px 32px !important;
+    font-size: 15px !important;
+  }
+
+  /* Inputs */
+  uni-page-body input,
+  uni-page-body textarea,
+  uni-page-body .uni-input-input {
+    font-size: 15px !important;
+    padding: 10px 16px !important;
+  }
+
+  /* Fix floating AI assistant (clear sidebar) */
   .ai-float-btn {
     right: 40px !important;
     bottom: 40px !important;