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/Search/Search.module.css

@@ -0,0 +1,36 @@
+.root {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-2);
+  padding: 5px var(--space-3);
+  border: var(--border-width) solid var(--color-border);
+  border-radius: var(--radius-full);
+  background: var(--color-bg-subtle);
+  transition: border-color var(--transition), background var(--transition);
+}
+
+.root:focus-within {
+  border-color: var(--color-primary);
+  background: var(--color-bg);
+}
+
+.icon {
+  color: var(--color-text-muted);
+  flex-shrink: 0;
+  display: block;
+}
+
+.input {
+  border: none;
+  background: transparent;
+  color: var(--color-text);
+  font-family: var(--font-family);
+  font-size: var(--font-size-xs);
+  outline: none;
+  width: 180px;
+  min-width: 0;
+}
+
+.input::placeholder {
+  color: var(--color-text-muted);
+}

client/src/ui/Search/Search.tsx

@@ -0,0 +1,23 @@
+import { Search as SearchIcon } from 'lucide-react';
+import styles from './Search.module.css';
+
+export interface SearchProps {
+  value: string;
+  onChange: (value: string) => void;
+  placeholder?: string;
+}
+
+export function Search({ value, onChange, placeholder = 'Search…' }: SearchProps) {
+  return (
+    <div className={styles.root}>
+      <SearchIcon size={13} className={styles.icon} />
+      <input
+        className={styles.input}
+        type="text"
+        value={value}
+        onChange={(e) => onChange(e.target.value)}
+        placeholder={placeholder}
+      />
+    </div>
+  );
+}

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';