Hey, no worries, been there, done that. It is your personal project — don't ever let anyone (including me) pressure you into doing any work you would not do yourself.

If this was my project and I was tasked with adding mobile support I'd add:

- a simple (optional) authentification scheme that let's you deploy the whole thing server side/log in remotely

- a alternative mobile interface that works well on smartphones without keyboards

Then the task data lives on the server and syncing is a on-issue