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 In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.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/helpers/forms_helper.rb

@@ -18,18 +18,9 @@ module FormsHelper
   end
 
   def period_select(form:, selected:, classes: "border border-tertiary shadow-xs rounded-lg text-sm pr-7 cursor-pointer text-primary focus:outline-hidden focus:ring-0")
-    periods_for_select = [
-      %w[CWD current_week], # Current Week to Date
-      %w[7D last_7_days],
-      %w[MTD current_month], # Month to Date
-      %w[1M last_30_days],
-      %w[CQD current_quarter], # Quarter to Date
-      %w[3M last_90_days],
-      %w[YTD current_year], # Year to Date
-      %w[1Y last_365_days]
-    ]
+    periods_for_select = Period.all.map { |period| [ period.label_short, period.key ] }
 
-    form.select(:period, periods_for_select, { selected: selected }, class: classes, data: { "auto-submit-form-target": "auto" })
+    form.select(:period, periods_for_select, { selected: selected.key }, class: classes, data: { "auto-submit-form-target": "auto" })
 end