feat(wiki): add rendered template preview to template dialog

Template dialog gains a rendered preview (markdown pipeline + scoped template CSS + HTML templates) alongside the existing source preview, with Rendered/Markdown toggle; editor threads the template maps through.

Ultraworked with [Sisyphus](https://github.com/code-yeongju/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/components/frontend/wiki/WikiEditor.tsx

@@ -215,6 +215,8 @@ export function WikiEditor({
             onLinkDialogChange={setLinkDialogOpen}
             pending={pending}
             templates={templates}
+            templateCssMap={templateCssMap}
+            templateHtmlMap={templateHtmlMap}
           />
         </div>
 

src/components/frontend/wiki/WikiEditorBody.tsx

@@ -63,6 +63,8 @@ interface WikiEditorBodyProps {
   readonly onLinkDialogChange: (open: boolean) => void;
   readonly pending: boolean;
   readonly templates: TemplateMap;
+  readonly templateCssMap?: Record<string, string>;
+  readonly templateHtmlMap?: Record<string, string>;
 }
 
 export function WikiEditorBody({
@@ -74,6 +76,8 @@ export function WikiEditorBody({
   onLinkDialogChange,
   pending,
   templates,
+  templateCssMap,
+  templateHtmlMap,
 }: WikiEditorBodyProps) {
   const fileInputRef = useRef<HTMLInputElement>(null);
   const mirrorRef = useRef<HTMLDivElement>(null);
@@ -429,6 +433,8 @@ export function WikiEditorBody({
         onOpenChange={setTemplateDialogOpen}
         disabled={pending}
         onInsert={insertTemplateBody}
+        templateCssMap={templateCssMap}
+        templateHtmlMap={templateHtmlMap}
       />
       <WikiEditorToolbar groups={groups} disabled={pending || uploading} />
       <div className="relative min-h-[23.5rem] w-full rounded-md border border-input bg-transparent shadow-sm transition-[box-shadow] focus-within:border-ring focus-within:ring-1 focus-within:ring-ring lg:h-[calc(100vh-10rem)]">

src/components/frontend/wiki/WikiTemplateDialog.tsx

@@ -14,6 +14,9 @@ import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { cn } from "@/lib/utils";
 import { extractPlaceholders, type TemplateMap } from "@/lib/wiki/templates";
+import { prepareMarkdown } from "@/lib/wiki/prepare";
+import { buildTemplateStyles } from "@/lib/wiki/templateCss";
+import { WikiPreparedBody } from "@/components/frontend/wiki/WikiContent";
 
 interface WikiTemplateDialogProps {
   readonly templates: TemplateMap;
@@ -21,6 +24,8 @@ interface WikiTemplateDialogProps {
   readonly onOpenChange: (open: boolean) => void;
   readonly disabled?: boolean;
   readonly onInsert: (body: string) => void;
+  readonly templateCssMap?: Record<string, string>;
+  readonly templateHtmlMap?: Record<string, string>;
 }
 
 function escapeRegExp(text: string): string {
@@ -48,9 +53,14 @@ export function WikiTemplateDialog({
   onOpenChange,
   disabled,
   onInsert,
+  templateCssMap,
+  templateHtmlMap,
 }: WikiTemplateDialogProps) {
   const [selectedName, setSelectedName] = useState<string | null>(null);
   const [values, setValues] = useState<Record<string, string>>({});
+  const [previewMode, setPreviewMode] = useState<"rendered" | "source">(
+    "rendered",
+  );
 
   const names = useMemo(() => Object.keys(templates).sort(), [templates]);
   const selectedBody = selectedName !== null ? (templates[selectedName] ?? "") : "";
@@ -62,11 +72,35 @@ export function WikiTemplateDialog({
     () => fillTemplate(selectedBody, values),
     [selectedBody, values],
   );
+  const preparedPreview = useMemo(
+    () =>
+      selectedName !== null
+        ? prepareMarkdown(filled, templates, templateHtmlMap ?? {})
+        : "",
+    [selectedName, filled, templates, templateHtmlMap],
+  );
+  const { css: previewCss, scopeClasses: previewScopeClasses } = useMemo(
+    () =>
+      buildTemplateStyles(
+        filled,
+        selectedName !== null
+          ? [
+              {
+                name: selectedName,
+                body: templates[selectedName] ?? "",
+                css: templateCssMap?.[selectedName] ?? null,
+              },
+            ]
+          : [],
+      ),
+    [filled, selectedName, templates, templateCssMap],
+  );
 
   function handleOpenChange(next: boolean) {
     if (!next) {
       setSelectedName(null);
       setValues({});
+      setPreviewMode("rendered");
     }
     onOpenChange(next);
   }
@@ -143,12 +177,48 @@ export function WikiTemplateDialog({
               </p>
             )}
             <div className="flex flex-col gap-1.5">
-              <span className="text-xs font-medium text-muted-foreground">
-                Preview
-              </span>
-              <pre className="max-h-40 overflow-auto rounded-md border bg-muted/20 p-3 font-mono text-xs whitespace-pre-wrap">
-                {filled}
-              </pre>
+              <div className="flex items-center justify-between">
+                <span className="text-xs font-medium text-muted-foreground">
+                  Preview
+                </span>
+                <div className="flex items-center gap-1">
+                  <Button
+                    type="button"
+                    size="sm"
+                    variant={previewMode === "rendered" ? "secondary" : "ghost"}
+                    className="h-6 px-2 text-xs"
+                    onClick={() => setPreviewMode("rendered")}
+                  >
+                    Rendered
+                  </Button>
+                  <Button
+                    type="button"
+                    size="sm"
+                    variant={previewMode === "source" ? "secondary" : "ghost"}
+                    className="h-6 px-2 text-xs"
+                    onClick={() => setPreviewMode("source")}
+                  >
+                    Markdown
+                  </Button>
+                </div>
+              </div>
+              {previewMode === "rendered" ? (
+                <div className="max-h-72 min-h-24 overflow-auto rounded-md border bg-muted/20 p-3">
+                  {previewCss ? (
+                    <style dangerouslySetInnerHTML={{ __html: previewCss }} />
+                  ) : null}
+                  <div className={cn("wiki-markdown", previewScopeClasses)}>
+                    <WikiPreparedBody
+                      prepared={preparedPreview}
+                      htmlTemplates={templateHtmlMap}
+                    />
+                  </div>
+                </div>
+              ) : (
+                <pre className="max-h-40 overflow-auto rounded-md border bg-muted/20 p-3 font-mono text-xs whitespace-pre-wrap">
+                  {filled}
+                </pre>
+              )}
             </div>
             <div className={cn("flex justify-end gap-2")}>
               <Button variant="outline" onClick={() => handleOpenChange(false)}>