fix: more work on liveview

Co-authored-by: Copilot <copilot@github.com>

priv/ui/app.css

@@ -62,6 +62,13 @@ body {
   font-size: var(--vscode-font-size);
 }
 
+body > [data-phx-session],
+body > [data-phx-main] {
+  width: 100%;
+  height: 100%;
+  min-height: 0;
+}
+
 button {
   font: inherit;
 }