fix: improve desktop layout, scrolling and background

src/App.vue

@@ -190,6 +190,7 @@ onUnmounted(() => {
   gap: 20px;
   width: 100%;
   padding-bottom: 50px;
+  padding-top: 100px; /* Space for fixed NavBar */
 }
 
 .install-banner {
@@ -204,6 +205,9 @@ onUnmounted(() => {
   max-width: 600px;
   margin: 0 auto 20px auto; /* Center it manually */
   box-shadow: var(--banner-shadow);
+  position: sticky;
+  left: 0;
+  right: 0;
 }
 
 .install-text {
@@ -239,6 +243,9 @@ onUnmounted(() => {
     margin-right: auto;
     max-width: 1200px; /* Keep constraint for panels */
     width: 100%;
+    position: sticky;
+    left: 0;
+    right: 0;
 }
 
 .board-section {

src/components/NavBar.vue

@@ -435,8 +435,10 @@ watch(isMobileMenuOpen, (val) => {
   justify-content: space-between;
   align-items: center;
   z-index: 100;
-  position: sticky;
+  position: fixed;
   top: 0;
+  left: 0;
+  right: 0;
 }
 
 .nav-left {

src/styles/main.css

@@ -130,7 +130,6 @@
 }
 
 html {
-  overflow-x: hidden;
   width: 100%;
 }
 
@@ -139,18 +138,18 @@ body {
   padding: 20px;
   font-family: 'Segoe UI', 'Roboto', Helvetica, Arial, sans-serif;
   background: var(--bg-gradient);
+  background-attachment: fixed;
+  background-size: cover;
   color: var(--text-color);
   min-height: 100vh;
   display: flex;
   flex-direction: column;
   align-items: center;
-  overflow-x: hidden;
 }
 
 /* Ensure no other content is visible */
 #app {
   width: 100%;
-  max-width: 100vw;
   display: flex;
   flex-direction: column;
   align-items: center;