Backend now stamps `_body` (full `$ <cmd>`) alongside `_summary` (first
line) and `_category: "rich"` for mcp__bash__run tool_use entries. The
frontend drops the mcp__bash__run-specific branch in renderRichToolUse
and uses a generic `if (c._body)` path instead — api.details() with the
backend-computed summary and body, no JS knowledge of the tool name.