Allow user to add buy and sell trade transactions for investment accounts (#1066)

* Consolidate modal form structure into partial + helper

* Scaffold out trade transaction form

* Normalize translations

* Add buy and sell trade form with tests

* Move entryable lists to dedicated controllers

* Delegate entry group contents rendering

* More cleanup

* Extract transaction and valuation update logic from entries controller

* Delegate edit and show actions to entryables

* Trade builder

* Update paths for transaction updates

app/controllers/account/transactions_controller.rb

@@ -0,0 +1,53 @@
+class Account::TransactionsController < ApplicationController
+  layout :with_sidebar
+
+  before_action :set_account
+  before_action :set_entry, only: :update
+
+  def index
+    @entries = @account.entries.account_transactions.reverse_chronological
+  end
+
+  def update
+    @entry.update!(entry_params.merge(amount: amount))
+    @entry.sync_account_later
+
+    respond_to do |format|
+      format.html { redirect_to account_entry_path(@account, @entry), notice: t(".success") }
+      format.turbo_stream { render turbo_stream: turbo_stream.replace(@entry) }
+    end
+  end
+
+  private
+
+    def set_account
+      @account = Current.family.accounts.find(params[:account_id])
+    end
+
+    def set_entry
+      @entry = @account.entries.find(params[:id])
+    end
+
+    def entry_params
+      params.require(:account_entry)
+            .permit(
+              :name, :date, :amount, :currency, :entryable_type,
+              entryable_attributes: [
+                :id,
+                :notes,
+                :excluded,
+                :category_id,
+                :merchant_id,
+                { tag_ids: [] }
+              ]
+            )
+    end
+
+    def amount
+      if params[:account_entry][:nature] == "income"
+        entry_params[:amount].to_d * -1
+      else
+        entry_params[:amount].to_d
+      end
+    end
+end