refactor(ui): move save/cancel buttons inline with session name

Shortens the session options modal by putting the name input
and action buttons on the same row at the top.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/web/public/styles.css

@@ -1026,8 +1026,13 @@ body {
 
 .form-row-inline {
   display: flex;
-  gap: 1rem;
+  gap: 0.5rem;
   margin-bottom: 0.75rem;
+  align-items: center;
+}
+
+.form-row-inline input[type="text"] {
+  flex: 1;
 }
 
 .form-col {