Place focus on navigation links when returning to main state

[basham]

• After editing a note
• After editing a category
• After creating a note
• After deleting a note
• After deleting a category

[basham]

After editing will be relatively easy. May be trickier to identify the created note, but not too terrible. After deleting is quite tricky.

[basham]

After deleting a note:

1. Focus on the previous note in the same category.
2. If no previous note in the same category, focus on next note in the same category.
3. If no other notes in the category, place focus on the category.
4. If category is Unspecified (and therefore not focusable), then place focus on the last user-generated category (the category immediately previous to Unspecified).
5. If there are no remaining user-created categories or notes within Unspecified, then there are no notes remaining. Place focus on New Quick Note button.

After deleting a category:

1. Focus on the previous category.
2. If no previous category, focus on the next category.
3. If no other categories, place focus on the first note in the Unspecified category.
4. If no notes in the Unspecified category, then place focus on New Quick Note button.