feat: compare limit 9, format-aware import placeholder, help links

- Raise compare limit from 8 to 9 (server + client, toast on overflow)
- Make import textarea placeholder match selected format (CSV/JSON/YAML/auto)
- Add GuideHelp links to admin create/edit user dialogs and tool import dialog

artifacts/toolrate/src/components/tool-import-dialog.tsx

@@ -7,6 +7,7 @@ import { Textarea } from "@/components/ui/textarea";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Label } from "@/components/ui/label";
+import { GuideHelp } from "@/components/guide-help";
 import { Upload, FileUp, CheckCircle2, AlertCircle } from "lucide-react";
 
 type Format = "auto" | "csv" | "json" | "yaml";
@@ -62,14 +63,24 @@ export function ToolImportDialog({
 
   const canSubmit = data.trim().length > 0 && !importTools.isPending;
 
+  const placeholder =
+    format === "csv"
+      ? t("adminTools.importTextareaPlaceholderCsv")
+      : format === "json"
+        ? t("adminTools.importTextareaPlaceholderJson")
+        : format === "yaml"
+          ? t("adminTools.importTextareaPlaceholderYaml")
+          : t("adminTools.importTextareaPlaceholderAuto");
+
   return (
     <Dialog open={open} onOpenChange={handleClose}>
       <DialogContent className="sm:max-w-2xl">
-        <DialogHeader>
+        <DialogHeader className="flex flex-row items-center justify-between gap-2">
           <DialogTitle className="flex items-center gap-2">
             <Upload className="w-4 h-4" />
             {t("adminTools.importTitle")}
           </DialogTitle>
+          <GuideHelp guide="administration" label={t("adminTools.importTitle")} />
         </DialogHeader>
 
         <div className="space-y-4 py-2">
@@ -131,7 +142,7 @@ export function ToolImportDialog({
           <Textarea
             value={data}
             onChange={(e) => setData(e.target.value)}
-            placeholder={t("adminTools.importTextareaPlaceholder")}
+            placeholder={placeholder}
             className="min-h-[220px] font-mono text-sm"
             data-testid="input-tool-import-data"
           />