Mesh chat: autoscroll toggle, hostname/slot toggle, and a formatting row behind one button

Style validation moves to one shared function so the sender and receiver cannot drift on what a style is.

Plugin/unraid/api/node_chat.php

@@ -73,7 +73,10 @@ if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
         $c['unread'] = $unread;
         $chans[] = $c;
     }
-    echo json_encode(['ok' => true, 'me' => vv_nc_me(), 'channels' => $chans]);
+    // Hostnames alongside the ids, so the card can show "unRAID-Jayred36" or "HOST2" without a
+    // second request — the mapping is master.conf's and the page should not be guessing it.
+    echo json_encode(['ok' => true, 'me' => vv_nc_me(), 'channels' => $chans,
+                      'hostnames' => vv_known_hosts()]);
     exit;
 }
 
@@ -85,8 +88,12 @@ if ($action === 'send') {
     $text = (string)($_POST['text'] ?? '');
     if (trim($text) === '') { echo json_encode(['ok' => false, 'error' => 'Nothing to send']); exit; }
     $msg = vv_nc_send($ch, $text, [
-        'color' => (string)($_POST['color'] ?? ''),
-        'font'  => (string)($_POST['font']  ?? ''),
+        'color'     => (string)($_POST['color'] ?? ''),
+        'font'      => (string)($_POST['font']  ?? ''),
+        'size'      => (string)($_POST['size']  ?? ''),
+        'bold'      => !empty($_POST['bold']),
+        'italic'    => !empty($_POST['italic']),
+        'underline' => !empty($_POST['underline']),
     ]);
     if (!$msg) { echo json_encode(['ok' => false, 'error' => 'Could not store message']); exit; }
     // Queued is not failed — say which, so a partner being asleep reads as pending rather than