Feedback categories page; treat 204 responses as success

Feedback → Categories: add, rename, reorder, archive/restore, and delete
unused categories. Feedback rows show the category's current label.

The API helper now accepts 204 No Content, which previously surfaced as a
"No Content" error after archive/delete and quiz attempt resets.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/(dashboard)/feedback/page.tsx

@@ -1,6 +1,8 @@
 "use client";
 
 import { useCallback, useState } from "react";
+import Link from "next/link";
+import { Tags } from "lucide-react";
 import { Can } from "@/components/staff-context";
 import { toast } from "sonner";
 import { api, AdminError, type AdminFeedback } from "@/lib/api";
@@ -70,21 +72,29 @@ export default function FeedbackPage() {
       total={list.total}
       list={list}
       toolbar={
-        <div className="flex gap-1 rounded-lg border border-border bg-card p-1">
-          {STATUSES.map((s) => (
-            <button
-              key={s}
-              onClick={() => setStatus(s)}
-              className={cn(
-                "rounded-md px-3 py-1.5 text-sm capitalize transition-colors",
-                status === s
-                  ? "bg-accent text-accent-foreground font-medium"
-                  : "text-muted-foreground hover:text-foreground",
-              )}
-            >
-              {s}
-            </button>
-          ))}
+        <div className="flex flex-wrap items-center gap-2">
+          <Link href="/feedback/categories">
+            <Button variant="outline" size="sm">
+              <Tags className="size-4" />
+              Categories
+            </Button>
+          </Link>
+          <div className="flex gap-1 rounded-lg border border-border bg-card p-1">
+            {STATUSES.map((s) => (
+              <button
+                key={s}
+                onClick={() => setStatus(s)}
+                className={cn(
+                  "rounded-md px-3 py-1.5 text-sm capitalize transition-colors",
+                  status === s
+                    ? "bg-accent text-accent-foreground font-medium"
+                    : "text-muted-foreground hover:text-foreground",
+                )}
+              >
+                {s}
+              </button>
+            ))}
+          </div>
         </div>
       }
     >
@@ -122,7 +132,7 @@ export default function FeedbackPage() {
                 </TD>
                 <TD className="max-w-md">
                   <div className="text-xs uppercase tracking-wide text-muted-foreground">
-                    {f.category}
+                    {f.category_label || f.category}
                   </div>
                   <div className="mt-0.5 whitespace-pre-line">{f.message}</div>
                   {f.reply_message ? (
@@ -246,7 +256,7 @@ function ReplyModal({
         {feedback ? (
           <div className="rounded-md bg-muted px-3 py-2 text-sm">
             <div className="text-xs uppercase tracking-wide text-muted-foreground">
-              {feedback.category}
+              {feedback.category_label || feedback.category}
             </div>
             <div className="mt-0.5 whitespace-pre-line">{feedback.message}</div>
           </div>