feat(savings_goals): drop Accounts section from index

The Accounts grid duplicated the sidebar account list. Removing it gives
the Goals section more breathing room and the page a tighter narrative:
header → KPIs → Goals.

Delete Savings::AccountCardComponent, Family#savings_subtype_accounts,
the @savings_accounts / @account_goal_counts controller refs, and the
related locale keys. Sidebar still shows the savings-subtype Depository
accounts under "Cash" — no information is lost.

app/controllers/savings_goals_controller.rb

@@ -15,8 +15,6 @@ class SavingsGoalsController < ApplicationController
     @completed_goals = all_goals.select { |g| g.state == "completed" }
 
     @linkable_account_count = Current.family.accounts.where(accountable_type: "Depository").visible.count
-    @savings_accounts = Current.family.savings_subtype_accounts
-    @account_goal_counts = goal_count_per_account(@savings_accounts)
     @kpi = kpi_payload(@active_goals)
     @show_search = @active_goals.size > 6
   end
@@ -195,17 +193,6 @@ class SavingsGoalsController < ApplicationController
       }
     end
 
-    def goal_count_per_account(accounts)
-      return {} if accounts.empty?
-
-      SavingsGoalAccount
-        .where(account_id: accounts.map(&:id))
-        .joins(:savings_goal)
-        .where.not(savings_goals: { state: %w[archived] })
-        .group(:account_id)
-        .count
-    end
-
     def stats_for(goal)
       avg = goal.average_monthly_contribution.to_d
       sub_avg = if goal.monthly_target_amount && goal.monthly_target_amount.to_d > avg