The agent-activity hover card renders one row per task and counts tasks.length, but it reused the agent-worded hover_header copy, so a single agent running multiple tasks made the card read '3 agents working' while the workspace chip read '2 working' (unique agents).
Add a dedicated hover_header_tasks key (en/zh-Hans/ja/ko) and point the hover card at it so the header now reads '3 tasks working'. The per-issue chip keeps hover_header since it genuinely passes the unique-agent count.
Co-authored-by: J <agent-j@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>
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