Add buffer header

Only for channels for now

style.css

@@ -7,7 +7,7 @@ html, body {
 
 body {
 	display: grid;
-	grid-template-rows: 1fr max-content;
+	grid-template-rows: auto 1fr max-content;
 	grid-template-columns: max-content auto;
 	font-family: monospace;
 }
@@ -20,7 +20,8 @@ body {
 
 #sidebar {
 	background-color: #e3e3e3;
-	grid-row: 1 / 3;
+	grid-column: 1;
+	grid-row: 1 / 4;
 }
 
 #sidebar ul {
@@ -42,8 +43,26 @@ body {
 	color: #b37400;
 }
 
+#topbar {
+	grid-row: 1;
+	grid-column: 2;
+	box-sizing: border-box;
+	padding: 5px 10px;
+	border-bottom: 1px solid #e3e3e3;
+}
+
+#topbar .actions {
+	float: right;
+}
+
+#buffer {
+	grid-row: 2;
+	grid-column: 2;
+}
+
 #composer {
 	grid-column: 2;
+	grid-row: 3;
 	border-top: 1px solid #e3e3e3;
 }
 #composer input {