feat(agent): improve live output UI and add execution history

- Fix duplicate icons in tool call rows (use chevron only for expand/collapse)
- Show detailed tool information (WebSearch queries, Agent prompts, Skill names)
- Add thinking/reasoning rows with Brain icon and expandable content
- Show tool results as separate chronological entries with previews
- Add TaskRunHistory component for viewing past agent execution logs
- Add listTasksByIssue API endpoint and task-runs route
- Support thinking content blocks in agent SDK (MessageThinking type)
- Improve callID→toolName mapping in daemon message forwarding

server/pkg/db/queries/agent.sql

@@ -134,6 +134,11 @@ SELECT * FROM agent_task_queue
 WHERE issue_id = $1 AND status IN ('dispatched', 'running')
 ORDER BY created_at DESC;
 
+-- name: ListTasksByIssue :many
+SELECT * FROM agent_task_queue
+WHERE issue_id = $1
+ORDER BY created_at DESC;
+
 -- name: UpdateAgentStatus :one
 UPDATE agent SET status = $2, updated_at = now()
 WHERE id = $1