Improve disk UI and build performance

web/static/style.css

@@ -69,6 +69,14 @@ a:hover { text-decoration: underline; }
   margin: 28px auto 56px;
 }
 
+.page-footer {
+  width: min(var(--content-width), calc(100vw - 48px));
+  margin: -28px auto 24px;
+  color: var(--muted);
+  font-size: 12px;
+  text-align: right;
+}
+
 /* Panel */
 .panel {
   margin-bottom: 24px;
@@ -259,6 +267,69 @@ a:hover { text-decoration: underline; }
 
 /* Checkbox list */
 .source-list { display: flex; flex-direction: column; gap: 0; }
+.source-tree {
+  padding: 8px 0;
+}
+.source-tree-empty {
+  padding: 12px 16px;
+}
+.source-node {
+  border-bottom: 1px solid var(--border-lite);
+}
+.source-node:last-child {
+  border-bottom: 0;
+}
+.source-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 16px;
+}
+.source-row:hover {
+  background: rgba(33, 133, 208, 0.04);
+}
+.source-toggle {
+  width: 24px;
+  height: 24px;
+  border: 1px solid transparent;
+  border-radius: var(--radius);
+  background: transparent;
+  color: var(--muted);
+  cursor: pointer;
+  flex: 0 0 24px;
+}
+.source-toggle:hover {
+  border-color: var(--border);
+  background: var(--surface-2);
+}
+.source-toggle-empty {
+  visibility: hidden;
+}
+.source-check {
+  width: 15px;
+  height: 15px;
+  accent-color: var(--accent);
+  cursor: pointer;
+}
+.source-label {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  min-width: 0;
+  flex: 1;
+}
+.source-item-hint {
+  font-size: 12px;
+  color: var(--muted);
+}
+.source-children {
+  padding-left: 20px;
+}
+.source-loading {
+  padding: 6px 16px 10px 48px;
+  color: var(--muted);
+  font-size: 12px;
+}
 .source-item {
   display: flex;
   align-items: center;
@@ -343,6 +414,7 @@ a:hover { text-decoration: underline; }
 @media (max-width: 720px) {
   .page-header { flex-wrap: wrap; padding: 12px 16px; }
   .page-main { width: calc(100vw - 24px); margin-top: 20px; }
+  .page-footer { width: calc(100vw - 24px); margin-top: -8px; }
   .disk-grid { grid-template-columns: 1fr; }
   .kv-table th { width: 130px; }
   .btn-row { flex-wrap: wrap; }