style(web): 更新审批中心、审计、政策制度页面样式，增强页面布局和视觉效果

web/src/assets/styles/views/approval-center-view.css

@@ -55,6 +55,42 @@
 
 .filter-set { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
 
+.list-search {
+  position: relative;
+  width: 220px;
+}
+
+.list-search .mdi {
+  position: absolute;
+  left: 12px;
+  top: 50%;
+  transform: translateY(-50%);
+  color: #64748b;
+  font-size: 15px;
+}
+
+.list-search input {
+  width: 100%;
+  height: 38px;
+  padding: 0 12px 0 36px;
+  border: 1px solid #d7e0ea;
+  border-radius: 8px;
+  background: #fff;
+  color: #0f172a;
+  font-size: 13px;
+  transition: border-color 160ms ease, box-shadow 160ms ease;
+}
+
+.list-search input::placeholder {
+  color: #8da0b4;
+}
+
+.list-search input:focus {
+  border-color: #10b981;
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.14);
+  outline: none;
+}
+
 .filter-btn, .page-size {
   min-height: 38px;
   display: inline-flex;
@@ -86,6 +122,11 @@
   background: linear-gradient(180deg, #fcfefd 0%, #f4f8f6 100%);
   display: flex;
   flex-direction: column;
+  align-items: stretch;
+  justify-content: flex-start;
+}
+
+.table-wrap.is-empty {
   align-items: center;
   justify-content: center;
 }
@@ -95,6 +136,54 @@
   align-self: flex-start;
 }
 
+.table-state {
+  width: 100%;
+  min-height: 260px;
+  display: grid;
+  place-items: center;
+  gap: 10px;
+  padding: 28px 20px;
+  text-align: center;
+  color: #64748b;
+  background: linear-gradient(180deg, #fcfffd 0%, #f5f9f7 100%);
+  align-self: center;
+}
+
+.table-state .mdi {
+  font-size: 28px;
+  color: #10b981;
+}
+
+.table-state strong {
+  color: #0f172a;
+  font-size: 15px;
+}
+
+.table-state p {
+  max-width: 420px;
+  margin: 0;
+  font-size: 13px;
+  line-height: 1.6;
+}
+
+.table-state.error .mdi {
+  color: #ef4444;
+}
+
+.state-action {
+  height: 36px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0 14px;
+  border: 1px solid rgba(16, 185, 129, 0.28);
+  border-radius: 8px;
+  background: #fff;
+  color: #059669;
+  font-size: 13px;
+  font-weight: 760;
+}
+
 table { width: 100%; min-width: 1180px; border-collapse: collapse; table-layout: fixed; }
 
 th, td {