Fix: Accessibility improvements for todo list

[tdrayson]

Issues found:

• [ ] Add capital letter to placeholder text
• [ ] Delete icon not keyboard accesible / focusable (should be )
• [ ] Drag icon not showing on focus, only hover
• [ ] Current priorities hide/show button not keyboard accesible / focusable
• [ ] Current priorities hide/show button has no context for keyboard and tooltip show is delayed too much on hover

Questions

• Does the task list reset at the end of the day?
• Perhaps an option to carry uncomplete tasks over to the next day
• Should tasks hide after being complete and moved to an accordian underneath called "completed tasks"

[jschuur]

Quick answers to the questions:

Task list resetting is something I logged for the future in a comment in #2. It doesn't do it yet, but I want this to be a server side thing, so the reset logic can run centrally, and I want to encrypt the items before I store them in the cloud.

Also need to think about what a good logic for resetting is, considering situations like carrying over tasks.

I had thought about sorting tasks, but I think people might have a reason for keeping tasks in a certain order and there might be a benefit in visualising them in that original order, so I didn't want to break that by default.