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/api/client.ts

@@ -209,8 +209,9 @@ export const runs = {
   list(scenarioId: string, page = 1, limit = 20): Promise<PaginatedResponse<ScenarioRun & { stepRuns: ScenarioRunStep[] }>> {
     return request(`/scenarios/${scenarioId}/runs?page=${page}&limit=${limit}`);
   },
-  get(scenarioId: string, runId: string): Promise<ScenarioRunDetail> {
-    return request(`/scenarios/${scenarioId}/run/${runId}`);
+  get(scenarioId: string, runId: string, q?: string): Promise<ScenarioRunDetail> {
+    const qs = q?.trim() ? `?q=${encodeURIComponent(q.trim())}` : '';
+    return request(`/scenarios/${scenarioId}/run/${runId}${qs}`);
   },
 };