feat(sqlserver): add execution plan support

apps/desktop/src/components/explain/ExplainPlanViewer.vue

@@ -45,6 +45,7 @@ const rawContent = computed(() => {
 });
 
 const isRawString = computed(() => typeof props.plan?.raw === "string");
+const rawFormatLabel = computed(() => (props.plan?.databaseType === "sqlserver" ? "XML" : isRawString.value ? "TEXT" : "JSON"));
 const nodeCount = computed(() => (props.plan ? flattenExplainPlanNodes(props.plan.nodes).length : 0));
 
 function tableCellText(value: unknown): string {
@@ -77,7 +78,7 @@ function tableCellText(value: unknown): string {
         <Button v-if="plan" size="sm" :variant="activeView === 'raw' ? 'secondary' : 'ghost'" class="h-6 px-2 text-xs gap-1" @click="activeView = 'raw'">
           <FileText v-if="isRawString" class="h-3.5 w-3.5" />
           <Braces v-else class="h-3.5 w-3.5" />
-          {{ isRawString ? "TEXT" : "JSON" }}
+          {{ rawFormatLabel }}
         </Button>
         <Button v-if="hasTableView" size="sm" :variant="activeView === 'table' ? 'secondary' : 'ghost'" class="h-6 px-2 text-xs gap-1" @click="activeView = 'table'">
           <Table2 class="h-3.5 w-3.5" />