Add "Nominal value" to open position summary

[kenkunz]

Goal

As an investor viewing an open position, I want to see the "nominal value" of the position (see below), so that I can compare it to the market sell value.

Background

See discord message.

@miohtama requested the following changes during the weekly backlog meeting:

let's add two rows

• Value (tooltip: value of the market sell of the position)
• Nominal value (tooltip: price * quantity if sold on unobtainable theoretical price)

He further clarified that we're just "adding" one row ("Nominal value") as the "Value" row already exists. At the moment, the "Nominal value" only applies to the "Latest" column.

Acceptance criteria

When viewing an open position's "Position Summary":

1. The current "Value" row "latest" column cell includes the following tooltip: "Value of the market sell of the position"
2. A new "Nominal value" row is displayed with a value only in the "latest" column, using the following formula: current quantity * current price
3. The value from #2 above includes the following tooltip: "price * quantity if sold on unobtainable theoretical price"
4. A % difference between the "latest value" and "latest nominal value" is displayed (UI details tbd)