feat(runs): add log search with backend LIKE filter and pagination

- add Search pill component with lucide icon and focus highlight
- wire debounced search input to GET /run/:id?q= backend filter
- backend filters run logs with LIKE %q% via TypeORM
- add sectionHeadingRow layout for heading + search alignment
- add i18n keys: runs.step_title, logs_search_placeholder

client/src/ui/index.ts

@@ -33,6 +33,9 @@ export type { TimestampProps } from './Timestamp/Timestamp';
 export { Pagination } from './Pagination/Pagination';
 export type { PaginationProps } from './Pagination/Pagination';
 
+export { Search } from './Search/Search';
+export type { SearchProps } from './Search/Search';
+
 export { ContextMenu } from './ContextMenu/ContextMenu';
 export type { ContextMenuProps, ContextMenuItem } from './ContextMenu/ContextMenu';