chore(isolatedMargin): update account info

[moo-onthelawn]

On Portfolio Page:

• Rename Cross Free Collateral → Available Balance

On Account Info Panel (Trade Page):

• Replace Cross Margin Usage with Portfolio Value
• Rename Cross Free Collateral -> Available Balance and add cross margin icon next to it (with tooltip of “Percentage of your total cross margin used by open positions.”)

Normal State	Trade State	Trade State w/ Errors

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Views

• portfolio/AccountDetailsAndHistory

  • Rename Free Collateral to Available Balance and update variable names

• AccountInfo/AccountInfoConnectedState

  • Replace MarginUsage -> PortfolioValue and BuyingPower -> AvailableBalance
  • Update hasDiff logic to check portfolioValue and availableBalance
  • Update error states on PortfolioValue and AvailableBalance to check if they're negative
  • Move crossMargin icon to be next to available balance with tooltip around it

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[linear]

CT-1108 update strings and add icon to "Available Balance"

[tyleroooo]

Why is equity going down when you are purchasing ETH?

Why do we show equity when it should stay the same when you buy/sell?

[moo-onthelawn]

Why is equity going down when you are purchasing ETH?

ah good point, hm currently it's going down because we're just looking at subaccount.equity, which in abacus is just doing a diff calculation based on how much you're spending to buy something (and not accounting for the value of the asset)

Why do we show equity when it should stay the same when you buy/sell?

related to above, we should probably not show a diff at all (it should just stay the same) - wil double check with se and then make the change!