Adds detailed QA checklist for the New UI send screen.

docs/send-screen-QA-checklist.md

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+Send screen QA checklist:
+
+## Send Eth mode
+  - [ ] **Header** _It should:_
+    - [ ] have title "Send ETH"
+    - [ ] have sub title "Only send ETH to an Ethereum address."
+    - [ ] return user to main screen when top right X is clicked
+  - [ ] **From row** _It should:_
+    - [ ] show the currently selected account by default 
+    - [ ] show a dropdown with all of the users accounts
+    - [ ] contain the following info for each account: identicon, account name, balance in ETH, balance in current currency
+    - [ ] change the account selected in the dropdown (but not the app-wide selected account) when one in the dropdown is clicked
+    - [ ] close the dropdown, without changing the dropdown selected account, when the dropdown is open and then a click happens outside it
+  - [ ] **To row** _It should:_
+    - [ ] Show a placeholder with the text 'Recipient Address' by default
+    - [ ] Show, when clicked, a dropdown list of all 'to accounts': the users accounts, plus any other accounts they have previously sent to
+    - [ ] Show account address, and account name if it exists, of each item in the dropdown list
+    - [ ] Show a dropdown list of all to accounts (see above) whose address matches an address currently being typed in
+    - [ ] Set the input text to the address of an account clicked in the dropdown list, and also hide the dropdown
+    - [ ] Hide the dropdown without changing what is in the input if the user clicks outside the dropdown list while it is open
+    - [ ] Select the text in the input (i.e. the address) if an address is displayed and then clicked
+    - [ ] Show a 'required' error if the dropdown is opened but no account is selected
+    - [ ] Show an 'invalid address' error if text is entered in the input that cannot be a valid hex address or ens address
+    - [ ] Support ens names. (enter dinodan.eth on mainnet) After entering the plain text address, the hex address should appear in the input with a green checkmark beside
+    - [ ] Should show a 'no such address' error if a non-existent ens address is entered
+  - [ ] **Amount row** _It should:_
+    - [ ] allow user to enter any rational number >= 0
+    - [ ] allow user to copy and paste into the field
+    - [ ] show an insufficient funds error if an amount > balance - gas fee
+    - [ ] display 'ETH' after the number amount. The position of 'ETH' should change as the length of the input amount text changes
+    - [ ] display the value of the amount of ETH in the current currency, formatted in that currency
+    - [ ] show a 'max' but if amount < balance - gas fee
+    - [ ] show no max button or error if amount === balance - gas fee
+    - [ ] set the amount to balance - gas fee if the 'max' button is clicked
+  - [ ] **Gas Fee Display row** _It should:_
+    - [ ] Default to the fee given by the estimated gas price
+    - [ ] display the fee in ETH and the current currency
+    - [ ] update when changes are made using the customize gas modal
+  - [ ] **Cancel button** _It should:_
+    - [ ] Take the user back to the main screen
+  - [ ] **submit button** _It should:_
+    - [ ] be disabled if no recipient address is provided or if any field is in error
+    - [ ] sign a transaction with the info in the above form, and display the details of that transaction on the confirm screen
+
+## Send token mode
+- [ ] **Header** _It should:_
+  - [ ] have title "Send Tokens"
+  - [ ] have sub title "Only send [token symbol] to an Ethereum address."
+  - [ ] return user to main screen when top right X is clicked
+- [ ] **From row** _It should:_
+  - [ ] Behave the same as 'Send ETH mode' (see above)
+- [ ] **To row** _It should:_
+  - [ ] Behave the same as 'Send ETH mode' (see above)
+- [ ] **Amount row** _It should:_
+  - [ ] allow user to enter any rational number >= 0
+  - [ ] allow user to copy and paste into the field
+  - [ ] show an 'insufficient tokens' error if an amount > token balance
+  - [ ] show an 'insufficient funds' error if an gas fee > eth balance
+  - [ ] display [token symbol] after the number amount. The position of [token symbol] should change as the length of the input amount text changes
+  - [ ] display the value of the amount of tokens in the current currency, formatted in that currency
+  - [ ] show a 'max' but if amount < token balance
+  - [ ] show no max button or error if amount === token balance
+  - [ ] set the amount to token balance if the 'max' button is clicked
+- [ ] **Gas Fee Display row** _It should:_
+  - [ ] Behave the same as 'Send ETH mode' (see above)
+- [ ] **Cancel button** _It should:_
+  - [ ] Take the user back to the main screen
+- [ ] **submit button** _It should:_
+  - [ ] be disabled if no recipient address is provided or if any field is in error
+  - [ ] sign a token transaction with the info in the above form, and display the details of that transaction on the confirm screen
+
+## Edit send Eth mode
+  - [ ] Say 'Editing transaction' in the header
+  - [ ] display a button to go back to the confirmation screen without applying update
+  - [ ] say 'update transaction' on the submit button
+  - [ ] update the existing transaction, instead of signing a new one, when clicking the submit button
+  - [ ] Otherwise, behave the same as 'Send ETH mode' (see above)
+
+## Edit send token mode
+  - [ ] Behave the same as 'Edit send Eth mode' (see above)
+
+## Specific cases to test
+ - [ ] Send eth to a hex address
+ - [ ] Send eth to an ENS address
+ - [ ] Donate to the faucet at https://faucet.metamask.io/ and edit the transaction before confirming
+ - [ ] Send a token that is available on the 'Add Token' screen search to a hex address
+ - [ ] Create a custom token at https://tokenfactory.surge.sh/ and send it to a hex address
+ - [ ] Send a token to an ENS address
+ - [ ] Create a token transaction using https://tokenfactory.surge.sh/#/, and edit the transaction before confirming
+ - [ ] Send each of MKR, EOS and ICON using myetherwallet, and edit the transaction before confirming