feat: update layout height to use dynamic viewport height for better responsiveness

app/[locale]/calendar/page.tsx

@@ -637,7 +637,7 @@ export default function CalendarPage() {
   };
 
   return (
-    <div className="flex h-screen bg-background">
+    <div className="flex h-dvh bg-background overflow-hidden">
       {/* Left Navigation Rail */}
       {!isMobile && (
         <div className="w-14 border-r border-border bg-secondary flex flex-col flex-shrink-0">

app/[locale]/contacts/page.tsx

@@ -441,7 +441,7 @@ export default function ContactsPage() {
   };
 
   return (
-    <div className="flex h-screen bg-background">
+    <div className="flex h-dvh bg-background overflow-hidden">
       {!isMobile && (
         <div className="w-14 border-r border-border bg-secondary flex flex-col flex-shrink-0">
           <NavigationRail

app/[locale]/page.tsx

@@ -827,7 +827,7 @@ export default function Home() {
 
   return (
     <DragDropProvider>
-      <div className="flex flex-col h-screen bg-background overflow-hidden">
+      <div className="flex flex-col h-dvh bg-background overflow-hidden">
         {connectionLost && (
           <div className="flex items-center justify-center gap-2 bg-destructive/10 border-b border-destructive/30 text-destructive text-sm py-1.5 px-4 flex-shrink-0">
             <RotateCcw className="h-3.5 w-3.5 animate-spin" />

app/[locale]/settings/page.tsx

@@ -97,7 +97,7 @@ export default function SettingsPage() {
     // Mobile: show content view
     if (mobileShowContent) {
       return (
-        <div className="flex flex-col h-screen bg-background">
+        <div className="flex flex-col h-dvh bg-background">
           {/* Mobile content header */}
           <div className="flex items-center gap-2 px-4 h-14 border-b border-border bg-background shrink-0">
             <Button
@@ -117,13 +117,16 @@ export default function SettingsPage() {
               {renderTabContent()}
             </div>
           </div>
+
+          {/* Bottom Navigation */}
+          <NavigationRail orientation="horizontal" />
         </div>
       );
     }
 
     // Mobile: show tab list
     return (
-      <div className="flex flex-col h-screen bg-background">
+      <div className="flex flex-col h-dvh bg-background">
         {/* Mobile header */}
         <div className="flex items-center gap-2 px-4 h-14 border-b border-border bg-background shrink-0">
           <Button
@@ -155,13 +158,16 @@ export default function SettingsPage() {
             ))}
           </div>
         </div>
+
+        {/* Bottom Navigation */}
+        <NavigationRail orientation="horizontal" />
       </div>
     );
   }
 
   // Desktop layout
   return (
-    <div className="flex h-screen bg-background">
+    <div className="flex h-dvh bg-background">
       {/* Navigation Rail */}
       <div className="w-14 border-r border-border bg-secondary flex flex-col flex-shrink-0">
         <NavigationRail

components/layout/navigation-rail.tsx

@@ -161,7 +161,7 @@ export function NavigationRail({
   if (orientation === "horizontal") {
     return (
       <nav
-        className={cn("flex items-center justify-around bg-background border-t border-border", className)}
+        className={cn("flex items-center justify-around bg-background border-t border-border shrink-0", className)}
         role="navigation"
         aria-label={t("nav_label")}
       >