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 In doing so, some parts of the codebase have become outdated, unnecessary, or overly-complex as a natural result of this feature prioritization.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

@@ -6,10 +6,6 @@ class BudgetsController < ApplicationController
   end
 
   def show
-    @next_budget = @budget.next_budget
-    @previous_budget = @budget.previous_budget
-    @latest_budget = Budget.find_or_bootstrap(Current.family)
-    render layout: with_sidebar
   end
 
   def edit
@@ -21,12 +17,6 @@ class BudgetsController < ApplicationController
     redirect_to budget_budget_categories_path(@budget)
   end
 
-  def create
-    start_date = Date.parse(budget_create_params[:start_date])
-    @budget = Budget.find_or_bootstrap(Current.family, date: start_date)
-    redirect_to budget_path(@budget)
-  end
-
   def picker
     render partial: "budgets/picker", locals: {
       family: Current.family,
@@ -44,12 +34,13 @@ class BudgetsController < ApplicationController
     end
 
     def set_budget
-      @budget = Current.family.budgets.find(params[:id])
-      @budget.sync_budget_categories
+      start_date = Budget.param_to_date(params[:month_year])
+      @budget = Budget.find_or_bootstrap(Current.family, start_date: start_date)
+      raise ActiveRecord::RecordNotFound unless @budget
     end
 
     def redirect_to_current_month_budget
-      current_budget = Budget.find_or_bootstrap(Current.family)
+      current_budget = Budget.find_or_bootstrap(Current.family, start_date: Date.current)
       redirect_to budget_path(current_budget)
     end
 end