chore: UI spacing tweaks, desktop scrolling fix, QR title alignment

src/style.css

@@ -2,8 +2,6 @@
 *, *::before, *::after {
   box-sizing: border-box;
 }
-
-@import 'tailwindcss';
 :root {
   font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
   line-height: 1.5;
@@ -115,13 +113,13 @@ body {
 
 @media (min-width: 768px) {
   body {
-    height: 100vh;
-    overflow: hidden;
+    min-height: 100vh;
+    overflow: auto;
   }
 
   #app {
-    height: 100vh;
-    overflow: hidden;
+    min-height: 100vh;
+    overflow: auto;
   }
 }
 
@@ -136,12 +134,12 @@ body {
   max-width: 800px;
   margin: 0 auto;
   height: 100%;
-  padding: 1rem;
+  padding: 0.5rem;
 }
 
 .tool-panel {
   width: 100%;
-  padding: 2rem;
+  padding: 1rem;
   border-radius: 16px;
   display: flex;
   flex-direction: column;