min send amount in pay-form is hard coded at 0.02

[sidvishnoi]

When sending one-time payments, the minimum sendable amount is hard-coded at 2 units, regardless of connected wallet and wallet addresses on the website.

When sending from MXN to USD, the min sendable amount should be around 0.19MXN. Currently the transactions fail, but the user doesn't know why they failed ("We were unable to process this transaction. Please try again!").

This will go hand-in-hand with #905.

We should set the min in the one-time-pay form to be dependent on current website's minSendAmount value. Relevant files to be updated:

• web-monetization-extension/src/background/services/monetization.ts

  Line 414 in 826cbb8

  async getPopupData(tab: Pick<Tabs.Tab, 'id' | 'url'>): Promise<PopupStore> {

• web-monetization-extension/src/background/services/paymentManager.ts

  Line 135 in 826cbb8

  get size() {

• web-monetization-extension/src/pages/popup/components/PayWebsiteForm.tsx

  Lines 103 to 106 in 826cbb8

  	min={roundWithPrecision(
  	2 / 10 ** walletAddress.assetScale,
  	walletAddress.assetScale,
  	)}

The PaymentManager would need a get minSendAmount(): bigint which returns minSendAmount across all payable sessions