fix(dashboard): route Executions tab click to execution detail, not chat

[esafwan]

Summary

• On /huf/dashboard, clicking an item in the Executions tab navigated to /chat/<conversation> instead of the execution detail page.
• RecentExecutionsTab.tsx now navigates to /executions/<run.name>, matching the pattern already used by the standalone Executions list page (Executions.tsx).
• isClickable gating updated from Boolean(run.conversation) to Boolean(run.name) (execution name is always present; conversation was often absent, which was also making some rows non-clickable).

Test plan

• yarn typecheck clean
• Reproduced the reported bug live on the pre-dev-stg verification bench (headless authenticated session, no password entry) — clicking an execution row navigated to /huf/chat/<conversation-id>
• Confirmed the destination route /executions/:runId already exists and renders via AgentRunDetailPageWrapper
• Not deployed/re-verified end-to-end against the shared pre-dev-stg bench, to avoid mutating shared staging infra for an unrelated verification pass — fix mirrors the identical, already-shipped navigation pattern in Executions.tsx