Add unit tests for the portfolio page correctly summing total XLM value across all held keys

[Chucks1093]

Summary

The portfolio page displays the total XLM value of all keys the user holds by summing (current price × quantity) across each position. Unit tests should confirm the total is correct for mixed portfolios and that it updates when a position's price changes.

Scope

• Test a portfolio with two positions returns the correct summed XLM total
• Test a portfolio with one position at quantity 0 is excluded from the total
• Test a portfolio with all positions at price 0 returns a total of 0 XLM
• Test that updating one position's price via the mock query causes the total to re-compute
• Assert the total is formatted to 2 decimal places in the rendered output

Acceptance Criteria

• Correct total for a multi-position portfolio
• Zero-quantity positions excluded from total
• Total of 0 XLM displayed correctly when all prices are 0
• Total updates reactively when position price changes
• Total formatted to 2 decimal places in the UI

ETA: 12 hours

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[sladeoj]

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hii maintainer i would love to work on this issue please

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[k-deejah]

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Hi Maintainer, I can work on this issue

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