📎 Anexos: botão de clipe + drag & drop + preview (imagens e documentos)

public/style.css

@@ -1255,6 +1255,93 @@ code {
   transition: transform 0.2s ease;
 }
 
+/* Botão de anexar */
+.btn-attach {
+  background: none;
+  border: none;
+  cursor: pointer;
+  padding: 8px;
+  border-radius: 8px;
+  color: var(--text-muted);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: all 0.2s;
+  flex-shrink: 0;
+}
+
+.btn-attach svg {
+  width: 20px;
+  height: 20px;
+}
+
+.btn-attach:hover {
+  background: var(--hover-bg);
+  color: var(--text-color);
+}
+
+.btn-attach.has-files {
+  color: var(--accent);
+}
+
+/* Preview de anexos na barra de input */
+.attachments-preview {
+  display: flex;
+  gap: 6px;
+  padding: 6px 12px;
+  flex-wrap: wrap;
+  border-top: 1px solid var(--border-color);
+  min-height: 0;
+}
+
+.attachment-item {
+  position: relative;
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 8px 4px 4px;
+  background: var(--hover-bg);
+  border-radius: 8px;
+  font-size: 12px;
+  color: var(--text-color);
+  border: 1px solid var(--border-color);
+  max-width: 150px;
+}
+
+.attachment-item img {
+  width: 36px;
+  height: 36px;
+  object-fit: cover;
+  border-radius: 6px;
+  border: 1px solid var(--border-color);
+  flex-shrink: 0;
+}
+
+.attachment-item .file-name {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  max-width: 90px;
+}
+
+.attachment-item .remove-attachment {
+  position: absolute;
+  top: -6px;
+  right: -6px;
+  width: 18px;
+  height: 18px;
+  border-radius: 50%;
+  background: #ef4444;
+  color: white;
+  border: none;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 12px;
+  line-height: 1;
+}
+
 .msg-action-btn.btn-speak svg {
   transition: transform 0.2s ease;
 }