[Enhancement]: Show the MCP server description in the agent builder's attached-tools list

[sisve]

What features would you like to see added?

The chat MCP dropdown and the MCP Settings panel both show an MCP server's configured description under its name. In the agent builder, the list of tools attached to an agent shows only the name and icon, so two similarly named servers can't be told apart without opening each one. I'd like the attached-tools rows for MCP servers to show the description too, on a second truncated line, matching the other two places.

More details

The data is already there: MCP catalog items carry description (client/src/components/SidePanel/Agents/Tools/items/catalog.ts, from server.metadata.description), so the change is confined to client/src/components/SidePanel/Agents/Tools/ToolRow.tsx. When the item is an MCP server with a description, render it as a truncated second line under the name and align the row to the top instead of the center. Rows without a description render exactly as today.

const description = item.kind === 'mcp' ? item.description : '';

return (
  <div className="group relative flex w-full items-center gap-2 rounded-lg px-2 py-1.5 hover:bg-surface-secondary">
    <div className={cn('flex min-w-0 flex-1 gap-2.5', description ? 'items-start' : 'items-center')}>
      <RowIcon item={item} />
      <div className="flex min-w-0 flex-1 flex-col">
        <span className="flex min-w-0 items-center gap-1 truncate text-sm text-text-primary">
          <span className="truncate font-medium">{displayName}</span>
          {suffix && <span className="text-text-secondary">{suffix}</span>}
        </span>
        {description && <p className="truncate text-xs text-text-secondary">{description}</p>}
      </div>
    </div>
    {/* ...status and action buttons unchanged... */}
  </div>
);

### Which components are impacted by your request?

UI

### Pictures

_No response_

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct