Launch the editor with the last active branch instead of the default branch

[infinitetrooper]

Currently, the editor always opens up in the default branch and this is a poor experience, the user either incorrectly makes changes on the default branch(which they should never do) or ends up switching the branch as the first step(annoyance).

We should instead open the editor on the last branch the user was on when they last opened the app in edit mode on that browser session.

Acceptance Criteria

• Scenario 1: Open editor with last active branch

  • Given the user has previously opened the app in edit mode
  • And the user has switched to a different branch during their last session
  • When the user opens the editor
  • Then the editor should open with the last active branch instead of the default branch

• Scenario 2: Open editor with default branch if no previous active branch

  • Given the user has previously opened the app in edit mode
  • And the user has not switched to a different branch during their last session
  • When the user opens the editor
  • Then the editor should open with the default branch

• Scenario 3: Open editor with default branch if no previous session

  • Given the user has never opened the app in edit mode before
  • When the user opens the editor
  • Then the editor should open with the default branch