feat(编辑功能): 优化水印定位与平铺，支持框选范围和全文应用，统一弹窗间距

assets/webui/ofdgo.css

@@ -141,6 +141,7 @@ a:focus-visible {
 .object-picker-list {
 	display: grid;
 	gap: 4px;
+	margin-bottom: 12px;
 	max-height: 55vh;
 	overflow-y: auto;
 }
@@ -657,6 +658,12 @@ button:not(:disabled):hover {
 	gap: 12px;
 }
 
+.annotation-placement {
+	display: grid;
+	grid-template-columns: minmax(0, 1fr) auto;
+	gap: 12px;
+}
+
 .form-row input[type="checkbox"] {
 	justify-self: start;
 	margin: 0;