Mail: write email button

[kulmann]

Initial Checklist

• I understand this is a user story and questions should be posted in the Community Discussions
• I searched issues and couldn’t find anything (or linked relevant results below)

User Story

• As a user, I want to enter the email compose view so that I can write an email

User Value

writing emails

Acceptance Criteria

• above the email listing we show a + Create new button
• button opens the email compose view by routing to /mail/create, adding draftId=new to the current route and adding accountId, mailboxId, mailId params as well if they exist