pdf-server: fix scrolling gap in inline mode

- Set html/body background to match .main background color
  This hides any gap between .main and iframe border
- Change .main from height:100% to min-height:100%
  Ensures .main fills container properly

Author: ochafik

examples/pdf-server/src/global.css

@@ -9,4 +9,6 @@ html, body {
   padding: 0;
   height: 100%;
   width: 100%;
+  /* Match .main background to hide any gap at the bottom */
+  background: var(--bg100, #f5f5f5);
 }

examples/pdf-server/src/mcp-app.css

@@ -5,7 +5,7 @@ body {
 .main {
   display: flex;
   flex-direction: column;
-  height: 100%;
+  min-height: 100%;
   width: 100%;
   background: var(--bg100, #f5f5f5);
   color: var(--text000, #1a1a1a);