New Design System + Codebase Refresh (#1823)

Since the very first 0.1.0-alpha.1 release, we've been moving quickly to add new features to the Maybe app. In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.

Now that "core" Maybe is complete, we're moving into a second phase of development where we'll be working hard to improve the accuracy of existing features and build additional features on top of "core". This PR is a quick overhaul of the existing codebase aimed to:

- Establish the brand new and simplified dashboard view (pictured above)
- Establish and move towards the conventions introduced in Cursor rules and project design overview #1788
- Consolidate layouts and improve the performance of layout queries
- Organize the core models of the Maybe domain (i.e. Account::Entry, Account::Transaction, etc.) and break out specific traits of each model into dedicated concerns for better readability
- Remove stale / dead code from codebase
- Remove overly complex code paths in favor of simpler ones

app/controllers/concerns/auto_sync.rb

@@ -13,9 +13,7 @@ module AutoSync
 
     def family_needs_auto_sync?
       return false unless Current.family.present?
-      return false unless Current.family.accounts.any?
 
-      Current.family.last_synced_at.blank? ||
-      Current.family.last_synced_at.to_date < Date.current
+      (Current.family.last_synced_at&.to_date || 1.day.ago) < Date.current
     end
 end