Better behaviour when session ends #40
Description
Currently, if a user keeps their browser open for 24h and does not reload the page, their session will be lost without the frontend being aware. This causes frontend errors.
Currently some code in the JS side will ask the user to reload the page after 24h:
https://github.com/voyages-sncf-technologies/vboard/blob/master/vboard-front/src/main/common/app/scripts/app.js#L48
However a SpringBoot session would be preferable. At least we should extend this 24h period to a week or a month.