Fix text selection: use !important to override Obsidian's user-select

Obsidian sets user-select: none with higher specificity. Add !important
on .vc-bubble and .vc-bubble * to ensure all message content including
rendered markdown children is selectable.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

styles.css

@@ -197,11 +197,16 @@
   border-radius: 12px;
   font-size: 13px;
   line-height: 1.55;
-  user-select: text;
-  -webkit-user-select: text;
+  user-select: text !important;
+  -webkit-user-select: text !important;
   cursor: text;
 }
 
+.vc-bubble * {
+  user-select: text !important;
+  -webkit-user-select: text !important;
+}
+
 .vc-msg--user .vc-bubble {
   background: var(--interactive-accent);
   color: var(--text-on-accent);