feat: 全站评论开关，并统一后台表单控件

关闭评论后前台隐藏评论能力；外观/设置/公告改用 AdminField 与 Stepper。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/admin/settings/SettingsAdmin.tsx

@@ -1,16 +1,9 @@
 "use client";
 
-import {
-  Code2,
-  Globe,
-  Loader2,
-  MessageSquare,
-  Save,
-  Sparkles,
-  UserPlus,
-} from "lucide-react";
+import { Globe, Loader2, MessageSquare, Save, UserPlus } from "lucide-react";
 import { useState } from "react";
 import {
+  AdminField,
   AdminPageHeader,
   AdminSection,
   AdminSettingRow,
@@ -24,33 +17,13 @@ export default function SettingsAdmin({ initial }: { initial: PublicSettings })
   const [siteDescription, setSiteDescription] = useState(initial.site_description);
   const [allowRegister, setAllowRegister] = useState(initial.allow_register);
   const [allowComments, setAllowComments] = useState(initial.allow_comments !== false);
-  const [codeAutoFold, setCodeAutoFold] = useState(
-    initial.code_block_auto_fold !== false
-  );
-  const [foldLines, setFoldLines] = useState(
-    Number.isFinite(initial.code_block_fold_lines) ? initial.code_block_fold_lines : 5
-  );
-  const [savedFoldLines, setSavedFoldLines] = useState(
-    Number.isFinite(initial.code_block_fold_lines) ? initial.code_block_fold_lines : 5
-  );
   const [savedName, setSavedName] = useState(initial.site_name);
   const [savedDesc, setSavedDesc] = useState(initial.site_description);
   const [saving, setSaving] = useState(false);
   const [togglingReg, setTogglingReg] = useState(false);
   const [togglingComments, setTogglingComments] = useState(false);
-  const [togglingFold, setTogglingFold] = useState(false);
-  const [savingFoldLines, setSavingFoldLines] = useState(false);
-  const [uiAnimations, setUiAnimations] = useState(initial.ui_animations !== false);
-  const [animCodeFold, setAnimCodeFold] = useState(initial.anim_code_fold !== false);
-  const [animSmoothScroll, setAnimSmoothScroll] = useState(
-    initial.anim_smooth_scroll !== false
-  );
-  const [animChrome, setAnimChrome] = useState(initial.anim_chrome !== false);
-  const [togglingMotion, setTogglingMotion] = useState(false);
 
-  const dirty =
-    siteName.trim() !== savedName || siteDescription.trim() !== savedDesc;
-  const foldLinesDirty = foldLines !== savedFoldLines;
+  const dirty = siteName.trim() !== savedName || siteDescription.trim() !== savedDesc;
 
   const saveIdentity = async () => {
     if (saving) return;
@@ -107,108 +80,35 @@ export default function SettingsAdmin({ initial }: { initial: PublicSettings })
     }
   };
 
-  const toggleCodeFold = async () => {
-    if (togglingFold) return;
-    const next = !codeAutoFold;
-    setTogglingFold(true);
-    try {
-      const res = await apiUpdateSiteSettings({ code_block_auto_fold: next });
-      setCodeAutoFold(res.code_block_auto_fold);
-      toast(
-        res.code_block_auto_fold
-          ? `已开启代码块自动折叠（超过 ${res.code_block_fold_lines} 行）`
-          : "已关闭代码块自动折叠",
-        "ok"
-      );
-    } catch (e) {
-      toast(e instanceof Error ? e.message : "保存失败");
-    } finally {
-      setTogglingFold(false);
-    }
-  };
-
-  const saveFoldLines = async () => {
-    if (savingFoldLines) return;
-    const raw = Math.round(Number(foldLines));
-    const n = Number.isFinite(raw) ? Math.max(0, Math.min(100, raw)) : 5;
-    setSavingFoldLines(true);
-    try {
-      const res = await apiUpdateSiteSettings({ code_block_fold_lines: n });
-      setFoldLines(res.code_block_fold_lines);
-      setSavedFoldLines(res.code_block_fold_lines);
-      toast(
-        res.code_block_fold_lines === 0
-          ? "折叠预览已设为 0 行（无预览）"
-          : `折叠阈值已设为超过 ${res.code_block_fold_lines} 行`,
-        "ok"
-      );
-    } catch (e) {
-      toast(e instanceof Error ? e.message : "保存失败");
-    } finally {
-      setSavingFoldLines(false);
-    }
-  };
-
-  const toggleMotionField = async (
-    key: "ui_animations" | "anim_code_fold" | "anim_smooth_scroll" | "anim_chrome",
-    next: boolean
-  ) => {
-    if (togglingMotion) return;
-    setTogglingMotion(true);
-    try {
-      const res = await apiUpdateSiteSettings({ [key]: next });
-      setUiAnimations(res.ui_animations);
-      setAnimCodeFold(res.anim_code_fold);
-      setAnimSmoothScroll(res.anim_smooth_scroll);
-      setAnimChrome(res.anim_chrome);
-      const labels: Record<typeof key, [string, string]> = {
-        ui_animations: ["已开启界面动画", "已关闭界面动画（全站减少动态效果）"],
-        anim_code_fold: ["已开启代码折叠动画", "已关闭代码折叠动画"],
-        anim_smooth_scroll: ["已开启平滑滚动", "已关闭平滑滚动"],
-        anim_chrome: ["已开启装饰入场动画", "已关闭装饰入场动画"],
-      };
-      toast(next ? labels[key][0] : labels[key][1], "ok");
-    } catch (e) {
-      toast(e instanceof Error ? e.message : "保存失败");
-    } finally {
-      setTogglingMotion(false);
-    }
-  };
-
   return (
     <div className="max-w-3xl">
       <AdminPageHeader
         icon={Globe}
         title="站点设置"
-        description="配置站点名称、简介与注册/评论开关；主题色请到「外观」页调整"
+        description="配置站点名称、简介与注册/评论开关；主题色、代码折叠与动画请到「外观」页调整"
       />
 
       <div className="flex flex-col gap-4">
-        <AdminSection
-          title="基本信息"
-          description="用于页眉品牌、页脚版权与 SEO 元信息"
-        >
-          <label className="field-label" htmlFor="site-name">
-            站点名称
-          </label>
-          <input
+        <AdminSection title="基本信息" description="用于页眉品牌、页脚版权与 SEO 元信息">
+          <AdminField
             id="site-name"
-            className="field mb-4"
+            className="mb-4"
+            label="站点名称"
             maxLength={32}
             value={siteName}
-            onChange={(e) => setSiteName(e.target.value)}
+            onChange={setSiteName}
             placeholder="姜十三论坛"
           />
 
-          <label className="field-label" htmlFor="site-desc">
-            站点简介
-          </label>
-          <textarea
+          <AdminField
             id="site-desc"
-            className="field min-h-[96px] mb-4"
+            className="mb-4"
+            label="站点简介"
+            as="textarea"
+            minHeight="96px"
             maxLength={160}
             value={siteDescription}
-            onChange={(e) => setSiteDescription(e.target.value)}
+            onChange={setSiteDescription}
             placeholder="一句话介绍社区定位…"
           />
 
@@ -248,7 +148,7 @@ export default function SettingsAdmin({ initial }: { initial: PublicSettings })
               <MessageSquare size={15} /> 开放评论
             </>
           }
-          description="关闭后全站禁止发表新评论与回复，已有评论仍可浏览。适用于 ICP/IPC 备案审核等合规需要；前台仅提示「暂停评论」，不会展示备案事由。"
+          description="关闭后前台不展示评论入口、评论数量与已有评论，并提示本站不支持评论。适用于备案审核等合规需要。"
           control={
             <AdminSwitch
               checked={allowComments}
@@ -258,132 +158,6 @@ export default function SettingsAdmin({ initial }: { initial: PublicSettings })
             />
           }
         />
-
-        <AdminSettingRow
-          title={
-            <>
-              <Code2 size={15} /> 代码块自动折叠
-            </>
-          }
-          description="开启后，帖子与评论中超过阈值行数的 Markdown 代码块默认折叠，读者可点「展开全部」。关闭则始终完整展示。"
-          control={
-            <AdminSwitch
-              checked={codeAutoFold}
-              disabled={togglingFold}
-              onChange={() => void toggleCodeFold()}
-              label="代码块自动折叠"
-            />
-          }
-        >
-          {codeAutoFold ? (
-            <>
-              <label className="field-label" htmlFor="fold-lines">
-                折叠行数阈值
-              </label>
-              <p className="meta text-[12.5px] mb-2.5 leading-relaxed">
-                代码块行数超过该值时折叠；折叠后约露出同样行数。设为 0 表示无预览。范围 0–100，默认 5。
-              </p>
-              <div className="flex flex-wrap items-center gap-2.5">
-                <input
-                  id="fold-lines"
-                  type="number"
-                  min={0}
-                  max={100}
-                  className="field w-24"
-                  value={foldLines}
-                  onChange={(e) => setFoldLines(Number(e.target.value))}
-                  aria-label="折叠行数阈值"
-                />
-                <span className="meta text-[12.5px]">行</span>
-                <button
-                  type="button"
-                  className="btn btn-line btn-sm"
-                  disabled={!foldLinesDirty || savingFoldLines}
-                  onClick={() => void saveFoldLines()}
-                >
-                  {savingFoldLines ? (
-                    <Loader2 size={14} className="animate-spin" />
-                  ) : (
-                    <Save size={14} />
-                  )}
-                  保存
-                </button>
-              </div>
-            </>
-          ) : null}
-        </AdminSettingRow>
-
-        <AdminSettingRow
-          title={
-            <>
-              <Sparkles size={15} /> 界面动画
-            </>
-          }
-          description="总开关关闭后全站即时切换（等同减少动态效果）。系统若已开启「减少动态效果」，始终优先生效。开启总开关后可细调子项。"
-          control={
-            <AdminSwitch
-              checked={uiAnimations}
-              disabled={togglingMotion}
-              onChange={() => void toggleMotionField("ui_animations", !uiAnimations)}
-              label="界面动画总开关"
-            />
-          }
-        >
-          {uiAnimations ? (
-            <div className="space-y-4">
-              <div className="flex items-start justify-between gap-4 flex-wrap">
-                <div className="min-w-0 flex-1">
-                  <p className="text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
-                    代码折叠动画
-                  </p>
-                  <p className="meta text-[12.5px] mt-0.5 leading-relaxed">
-                    代码块展开/收起的高度过渡与跟滚。
-                  </p>
-                </div>
-                <AdminSwitch
-                  checked={animCodeFold}
-                  disabled={togglingMotion}
-                  onChange={() => void toggleMotionField("anim_code_fold", !animCodeFold)}
-                  label="代码折叠动画"
-                />
-              </div>
-              <div className="flex items-start justify-between gap-4 flex-wrap">
-                <div className="min-w-0 flex-1">
-                  <p className="text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
-                    平滑滚动
-                  </p>
-                  <p className="meta text-[12.5px] mt-0.5 leading-relaxed">
-                    目录跳转、回顶、新内容提示等 scroll 行为。
-                  </p>
-                </div>
-                <AdminSwitch
-                  checked={animSmoothScroll}
-                  disabled={togglingMotion}
-                  onChange={() =>
-                    void toggleMotionField("anim_smooth_scroll", !animSmoothScroll)
-                  }
-                  label="平滑滚动"
-                />
-              </div>
-              <div className="flex items-start justify-between gap-4 flex-wrap">
-                <div className="min-w-0 flex-1">
-                  <p className="text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
-                    装饰入场
-                  </p>
-                  <p className="meta text-[12.5px] mt-0.5 leading-relaxed">
-                    列表入场、Toast、点赞弹出、在线脉冲等装饰性动画。
-                  </p>
-                </div>
-                <AdminSwitch
-                  checked={animChrome}
-                  disabled={togglingMotion}
-                  onChange={() => void toggleMotionField("anim_chrome", !animChrome)}
-                  label="装饰入场"
-                />
-              </div>
-            </div>
-          ) : null}
-        </AdminSettingRow>
       </div>
     </div>
   );