Invalidate cached suffix geometry in LLFolderViewItem::refreshSuffix

LLFontVertexBuffer::render does not compare the rendered string, so any
path that changes mLabelSuffix must reset the cached geometry or draw()
replays the old text. refresh() already does this; mirror it in
refreshSuffix(), which is reached via arrange() for items deferred from
postBuild(). Currently the buffer is always null on that path (items
arrange before first draw), so this is hardening against reordering or
future callers rather than a user-visible defect.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: RyeMutt

indra/llui/llfolderviewitem.cpp

@@ -447,6 +447,13 @@ void LLFolderViewItem::refreshSuffix()
         mLabelStyle = vmi->getLabelStyle();
         pLabelFont = nullptr;
         mLabelSuffix = utf8str_to_wstring(vmi->getLabelSuffix());
+        // LLFontVertexBuffer::render doesn't compare the string, so cached
+        // geometry must be invalidated here or it would replay the old suffix.
+        // (A style change is covered by render's font-pointer compare.)
+        if (mSuffixFontBuffer)
+        {
+            mSuffixFontBuffer->reset();
+        }
     }
 
     mLabelWidthDirty = true;