feat: add App Config detail page with view/edit mode

Click a row in the admin App Config table to navigate to a dedicated
detail page at /admin/appconfig/:appId. Shows all config fields as
badges in view mode; pencil toggles to edit mode with dropdowns.

Traced processors are now editable (capture mode dropdown + remove
button per processor). Sections and header use card styling for
visual contrast. OidcConfigPage gets the same card treatment.

List page simplified to read-only badge overview with row click
navigation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/Admin/AppConfigDetailPage.module.css

@@ -0,0 +1,165 @@
+.page {
+  max-width: 640px;
+  margin: 0 auto;
+}
+
+.loading {
+  display: flex;
+  justify-content: center;
+  padding: 4rem;
+}
+
+.toolbar {
+  display: flex;
+  gap: 8px;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 20px;
+}
+
+.backBtn {
+  background: none;
+  border: none;
+  color: var(--amber);
+  cursor: pointer;
+  font-size: 13px;
+  font-weight: 500;
+  padding: 4px 0;
+}
+
+.backBtn:hover {
+  color: var(--amber-deep);
+  text-decoration: underline;
+}
+
+.toolbarActions {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.editBtn {
+  background: none;
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-sm);
+  color: var(--text-secondary);
+  cursor: pointer;
+  font-size: 12px;
+  padding: 5px 12px;
+}
+
+.editBtn:hover {
+  border-color: var(--amber);
+  color: var(--amber);
+}
+
+.cancelBtn {
+  background: none;
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 12px;
+  padding: 5px 12px;
+}
+
+.cancelBtn:hover {
+  border-color: var(--text-faint);
+  color: var(--text-primary);
+}
+
+.removeBtn {
+  background: none;
+  border: none;
+  color: var(--text-faint);
+  cursor: pointer;
+  font-size: 16px;
+  padding: 0 4px;
+  line-height: 1;
+}
+
+.removeBtn:hover {
+  color: var(--error);
+}
+
+.header {
+  margin-bottom: 16px;
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  padding: 16px 20px;
+}
+
+.title {
+  font-size: 18px;
+  font-weight: 600;
+  color: var(--text-primary);
+  margin: 0 0 4px;
+}
+
+.meta {
+  font-size: 11px;
+  color: var(--text-muted);
+}
+
+.section {
+  margin-bottom: 16px;
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  background: var(--bg-surface);
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
+  padding: 16px 20px;
+}
+
+.field {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 4px;
+}
+
+.label {
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--text-secondary);
+}
+
+.select {
+  padding: 6px 10px;
+  border: 1px solid var(--border-subtle);
+  border-radius: var(--radius-sm);
+  background: var(--bg-body);
+  color: var(--text-primary);
+  font-size: 13px;
+  font-family: var(--font-mono);
+  outline: none;
+  max-width: 360px;
+}
+
+.select:focus {
+  border-color: var(--amber);
+}
+
+.toggleRow {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 13px;
+  color: var(--text-secondary);
+  cursor: pointer;
+}
+
+.toggleRow input {
+  accent-color: var(--amber);
+  cursor: pointer;
+}
+
+.hint {
+  font-size: 11px;
+  color: var(--text-muted);
+  font-family: var(--font-body);
+}