fix: nunjuclk rendering

frontend/src/components/nodes/RenderingNode.tsx

@@ -480,12 +480,14 @@ function RenderingNodeComponent({ id, data, width, height, selected }: Props) {
                         return
                     }
 
-                    setResolvedContent(afterNunjucks)
+                    // Collapse runs of newlines so {% for %} / {{ }} on their own lines don't leave blank lines
+                    const resolved = afterNunjucks.replace(/(\r?\n)(\s*\r?\n)+/g, '$1').trim()
+                    setResolvedContent(resolved)
                     const typeRenderer = getConfigType(configTypeId)
 
                     try {
                         const renderOptions = configTypeId === 'wireframe' ? { width: viewportWidth, height: viewportHeight } : undefined
-                        const htmlOrSvg = await typeRenderer.render(afterNunjucks, renderOptions)
+                        const htmlOrSvg = await typeRenderer.render(resolved, renderOptions)
                         if (cancelled || thisRunId !== runIdRef.current) return
                         setRenderedContent(htmlOrSvg)
                         setError(null)
@@ -539,6 +541,18 @@ function RenderingNodeComponent({ id, data, width, height, selected }: Props) {
     // Kroki and other SVG sources may prepend <?xml ... ?> so we detect by presence of <svg> tag
     const isSvgOutput = Boolean(renderedContent?.trim() && /<svg[\s>]/i.test(renderedContent.trim()))
 
+    /** Strip remaining Nunjucks tags from resolved content for display in raw view (so tags don't show as literal lines). */
+    const rawDisplayContent = useMemo(() => {
+        if (resolvedContent == null) return ''
+        return resolvedContent
+            .replace(/\{%[\s\S]*?%\}/g, '')
+            .replace(/\{\{[\s\S]*?\}\}/g, '')
+            .replace(/\{#[\s\S]*?#\}/g, '')
+            .replace(/(\r?\n)\s*(\r?\n)/g, '$1$2')
+            .replace(/^\s*\n|\n\s*$/g, (m) => (m === '\n' ? '\n' : ''))
+            .trim()
+    }, [resolvedContent])
+
     /** Process SVG HTML so it keeps aspect ratio and fills the viewport (used only for display, not download). */
     const displayContent = useMemo(() => {
         if (!renderedContent || !isSvgOutput) return renderedContent
@@ -650,16 +664,34 @@ function RenderingNodeComponent({ id, data, width, height, selected }: Props) {
                             <ToggleGroup
                                 type="single"
                                 value={viewMode}
-                                onValueChange={(v) => v && (v === 'preview' || v === 'raw') && setViewMode(v)}
+                                onValueChange={(v) => {
+                                    if (v === 'preview' || v === 'raw') setViewMode(v)
+                                }}
                                 aria-label="View mode"
                                 variant="outline"
                                 size="sm"
                                 className="gap-0 rounded-md p-0.5 [&>button]:rounded-none [&>button:first-child]:rounded-l-md [&>button:last-child]:rounded-r-md [&>button:not(:first-child)]:border-l-0"
                             >
-                                <ToggleGroupItem value="preview" aria-label="Preview" className="gap-1.5 px-2.5 h-7">
+                                <ToggleGroupItem
+                                    value="preview"
+                                    aria-label="Preview"
+                                    className="gap-1.5 px-2.5 h-7"
+                                    onClick={(e) => {
+                                        e.stopPropagation()
+                                        setViewMode('preview')
+                                    }}
+                                >
                                     Preview
                                 </ToggleGroupItem>
-                                <ToggleGroupItem value="raw" aria-label="Raw config" className="gap-1.5 px-2.5 h-7">
+                                <ToggleGroupItem
+                                    value="raw"
+                                    aria-label="Raw config"
+                                    className="gap-1.5 px-2.5 h-7"
+                                    onClick={(e) => {
+                                        e.stopPropagation()
+                                        setViewMode('raw')
+                                    }}
+                                >
                                     Raw
                                 </ToggleGroupItem>
                             </ToggleGroup>
@@ -800,18 +832,18 @@ function RenderingNodeComponent({ id, data, width, height, selected }: Props) {
                                     size="icon"
                                     className="absolute top-2 right-2 z-10 h-7 w-7 shrink-0 rounded-md shadow-sm"
                                     onClick={() => {
-                                        const text = resolvedContent ?? ''
+                                        const text = rawDisplayContent
                                         if (text) {
                                             navigator.clipboard?.writeText(text).then(() => toast.success('Copied to clipboard')).catch(() => {})
                                         }
                                     }}
-                                    disabled={!resolvedContent}
+                                    disabled={!rawDisplayContent}
                                     title="Copy raw output"
                                 >
                                     <Copy className="size-3.5" />
                                 </Button>
                                 <CodeMirror
-                                    value={resolvedContent ?? ''}
+                                    value={rawDisplayContent}
                                     height={`${rawEditorHeight}px`}
                                     theme={theme}
                                     extensions={rawExtensions}
@@ -917,7 +949,7 @@ function RenderingNodeComponent({ id, data, width, height, selected }: Props) {
                 <BaseNodeFooter>
                     <NodeFooterEdgeIndicators nodeId={id} nodeType="render">
                         {viewMode === 'raw'
-                            ? (resolvedContent != null ? `Raw · ${resolvedContent.length} chars` : '—')
+                            ? (rawDisplayContent ? `Raw · ${rawDisplayContent.length} chars` : '—')
                             : renderedContent
                                 ? `${configType.label} · ${renderedContent.length} chars`
                                 : error