fix: reduce API load on some page and add progress spinner

[taro04]

@YasunoriMATSUOKA Please review.

To do :

• Reduce Rest API access load by stopping continuous Rest API access on timer. --> delete timer Observable
• To prohibit the user from sending transactions, display the loading is during data acquisition. --> add progress spiner in html

[YasunoriMATSUOKA]

Memo: This PR is related to https://github.com/UnUniFi/utils/issues/238

[taro04]

@YasunoriMATSUOKA Please review ( I wonder, reviewer is correct. )

• add snackbar message on the point that returns error
• repayment -> principal
• add principal and collateral verification to the view component