RFC: introduces some iOS widgets!

[krugerk]

Introducing WidgetKit widgets!

This MR consists of a widget bundle and three widgets.

• bundle - for allowing for more than one widget widgets:
  • goal countdown: displays a goal in its countdown color
  • goal list: list of goals, sorted by urgency
  • on the line: sum of pledge amount

The app already handled the url beeminder://?slug=goalname to open the goalvc of the corresponding goal and the widgets use this

breaks the ice, fixes: #68

Examples:

list of goals

in medium and large

goal countdown color

pledged

and of course in both light and dark,

https://github.com/user-attachments/assets/7e6f7c66-bb7d-4929-8620-4dee03ae970b

[theospears]

To set expectations, my release plan right now is:

• 6.7 - the new CoreData based data model, but no big feature additions
• 6.8 - if needed, a fast follow to fix crashes or other issues introduced by 6.7
• 7.0 - few features, like widgets and more shortcuts