HEL-124: 第5批——缺口态补画 + 响应式扫尾 + 清理旧黑绿残留

- design-system.css: 补 .app-view/.is-active/.sr-only/.skip-link 结构类、Toast(带 kind)、侧滑详情抽屉、加载骨架/加载中行、.notice.success、窄屏侧栏折叠(汉堡菜单)
- app.js: 重写 showToast(带 kind) 与 initDetailDrawer 用新 token；fetch 补加载中/错误/空态；detailContent 改真实文案并接线 data-detail 触发；清理 animateView/initMotion/initShell 旧类名残留；COMPANY_FLOWS 加「原型占位」注释
- admin.html/company.html: 移除 styles.css 引用、bump ?v=3；待办列表接 data-detail
- 删除 web/styles.css（源头删净 #050505/#37eb89/--color-*/--jn-* 等旧黑绿残留）
- index/login 页 bump ?v=2

Co-authored-by: multica-agent <github@multica.ai>

web/design-system.css

@@ -363,6 +363,9 @@ p { margin: 0; }
 .list-row .lr-title { font-weight: 550; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .list-row .lr-sub { font-size: 12px; color: var(--muted); margin-top: 1px; }
 .list-row .lr-side { text-align: right; flex: none; }
+[data-detail] { cursor: pointer; }
+.list-row[data-detail]:hover { background: var(--fg-soft); }
+.list-row[data-detail] { margin-inline: -4px; padding-inline: 4px; border-radius: var(--radius); }
 
 /* ─── 弹窗 ──────────────────────────────────────────────────────── */
 .modal-backdrop {
@@ -573,3 +576,118 @@ a.flow-step.doing:hover { background: color-mix(in oklch, var(--warn) 16%, trans
 .portal-card p { color: var(--muted); font-size: 13px; margin-top: 6px; }
 .portal-card .pc-go { font-size: 12.5px; font-weight: 600; color: var(--accent); margin-top: 14px; }
 @media (max-width: 720px) { .portal-grid { grid-template-columns: 1fr; } }
+
+/* ─── SPA 视图切换 / 无障碍结构类 ───────────────────────────────── */
+.app-view { display: none; }
+.app-view.is-active { display: block; }
+.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
+.skip-link {
+  position: fixed; top: 8px; left: 50%; z-index: 500;
+  padding: 8px 14px;
+  border-radius: var(--radius);
+  background: var(--accent); color: var(--surface);
+  font-size: 13px; font-weight: 600;
+  transform: translate(-50%, -150%);
+  transition: transform 0.12s ease;
+}
+.skip-link:focus { transform: translate(-50%, 0); }
+
+/* ─── 图标按钮 / 窄屏侧栏折叠 ──────────────────────────────────── */
+.icon-button {
+  display: inline-grid; place-items: center;
+  width: 34px; height: 34px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--surface); color: var(--muted);
+  cursor: pointer;
+  transition: border-color 0.12s ease, background 0.12s ease, color 0.12s ease;
+}
+.icon-button:hover { color: var(--fg); border-color: color-mix(in oklch, var(--fg) 40%, var(--border)); background: var(--fg-soft); }
+.icon-button svg { width: 18px; height: 18px; }
+.menu-button { display: none; }
+@media (max-width: 860px) {
+  .menu-button { display: inline-grid; }
+  .shell { grid-template-columns: 1fr; }
+  .sidebar {
+    position: fixed; top: 0; left: 0; bottom: 0; z-index: 40;
+    width: var(--side-w); height: 100dvh;
+    transform: translateX(-100%);
+    transition: transform 0.2s ease;
+  }
+  .sidebar.is-open { transform: none; box-shadow: 0 0 48px color-mix(in oklch, var(--fg) 22%, transparent); }
+}
+
+/* ─── Toast 轻量提示 ───────────────────────────────────────────── */
+.toast-region { position: fixed; right: 16px; bottom: 16px; z-index: 300; display: grid; gap: 8px; }
+.toast {
+  display: flex; align-items: flex-start; gap: 9px;
+  min-width: 260px; max-width: 380px;
+  padding: 11px 14px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius-lg);
+  background: var(--surface);
+  box-shadow: 0 12px 34px color-mix(in oklch, var(--fg) 18%, transparent);
+  font-size: 13px;
+}
+.toast .t-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; margin-top: 5px; background: var(--muted); }
+.toast .t-body { min-width: 0; }
+.toast .t-title { font-weight: 650; }
+.toast .t-detail { color: var(--muted); font-size: 12px; margin-top: 1px; }
+.toast.success { border-color: color-mix(in oklch, var(--success) 35%, var(--border)); }
+.toast.success .t-dot { background: var(--success); }
+.toast.warn { border-color: color-mix(in oklch, var(--warn) 40%, var(--border)); }
+.toast.warn .t-dot { background: var(--warn); }
+.toast.danger { border-color: color-mix(in oklch, var(--danger) 35%, var(--border)); }
+.toast.danger .t-dot { background: var(--danger); }
+.toast.info { border-color: color-mix(in oklch, var(--info) 35%, var(--border)); }
+.toast.info .t-dot { background: var(--info); }
+@media (max-width: 720px) {
+  .toast-region { right: 12px; bottom: 12px; left: 12px; }
+  .toast { min-width: 0; max-width: none; }
+}
+
+/* ─── 侧滑详情抽屉（用 modal/card token 重画） ─────────────────── */
+.drawer {
+  position: fixed; top: 0; right: 0; bottom: 0; z-index: 60;
+  width: min(400px, calc(100vw - 24px));
+  display: flex; flex-direction: column;
+  background: var(--surface);
+  border-left: 1px solid var(--border);
+  box-shadow: -18px 0 50px color-mix(in oklch, var(--fg) 22%, transparent);
+  transform: translateX(100%);
+  visibility: hidden;
+  transition: transform 0.22s ease, visibility 0.22s;
+}
+.drawer.is-open { transform: none; visibility: visible; }
+.drawer-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; padding: 18px 20px 12px; border-bottom: 1px solid var(--border); }
+.drawer-head .d-title { font-size: 16px; font-weight: 700; margin-top: 6px; }
+.drawer-head .d-desc { color: var(--muted); font-size: 12.5px; margin-top: 4px; }
+.drawer-body { flex: 1; overflow-y: auto; padding: 16px 20px; }
+.drawer-body .kv { grid-template-columns: auto 1fr; gap: 8px 18px; }
+.drawer-body .kv dt { color: var(--muted); white-space: nowrap; }
+.drawer-body .kv dd { text-align: right; word-break: break-all; }
+.drawer-tip { margin: 0 20px 12px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); color: var(--muted); font-size: 12.5px; }
+.drawer-tip strong { display: block; color: var(--fg); margin-bottom: 4px; }
+.drawer-foot { display: flex; justify-content: flex-end; gap: 8px; padding: 14px 20px; border-top: 1px solid var(--border); }
+
+/* ─── 加载中骨架 / 表内加载行 ──────────────────────────────────── */
+.skeleton { display: block; border-radius: var(--radius); background: var(--fg-soft); position: relative; overflow: hidden; }
+.skeleton::after {
+  content: ""; position: absolute; inset: 0;
+  background: linear-gradient(90deg, transparent, color-mix(in oklch, var(--surface) 60%, transparent), transparent);
+  animation: skeleton-shimmer 1.3s ease-in-out infinite;
+}
+@keyframes skeleton-shimmer { from { transform: translateX(-100%); } to { transform: translateX(100%); } }
+.skeleton-line { height: 12px; margin-bottom: 10px; }
+.loading-row { padding: 40px 20px; text-align: center; color: var(--muted); font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.04em; }
+.loading-inline { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-family: var(--font-mono); font-size: 12.5px; }
+.loading-inline::before {
+  content: ""; width: 12px; height: 12px; border-radius: 50%;
+  border: 2px solid var(--border); border-top-color: var(--accent);
+  animation: loading-spin 0.7s linear infinite;
+}
+@keyframes loading-spin { to { transform: rotate(360deg); } }
+
+/* ─── 提示条补充：成功态 ───────────────────────────────────────── */
+.notice.success { background: var(--success-soft); border-color: color-mix(in oklch, var(--success) 30%, transparent); }
+.notice.success .n-title { color: color-mix(in oklch, var(--success) 82%, black); }