Add Interactive Brokers Provider (#1722)

* Display multi-currency holdings correctly

* Implement IBKR provider

* Fix: Use historical exchange rate for historical prices

* Add brokerage exchange rate for trades

* Sync historical balances from IBKR

* Add logos in activity history

* Fix privacy mode blur in account view

* Improve IBKR XML Flex report parser errors

test/models/snaptrade_account_processor_test.rb

@@ -129,6 +129,36 @@ class SnaptradeAccountProcessorTest < ActiveSupport::TestCase
     assert_equal 0, @account.holdings.count
   end
 
+  test "processor trusts API total for multi-currency holdings" do
+    security = securities(:aapl)
+    Account.any_instance.stubs(:set_current_balance)
+
+    @snaptrade_account.update!(
+      currency: "CHF",
+      current_balance: BigDecimal("15000.00"),
+      cash_balance: BigDecimal("1000.00"),
+      raw_holdings_payload: [
+        {
+          "symbol" => {
+            "symbol" => { "symbol" => security.ticker, "description" => security.name }
+          },
+          "units" => "10",
+          "price" => "150.00",
+          "currency" => "USD",
+          "average_purchase_price" => "125.50"
+        }
+      ],
+      raw_activities_payload: []
+    )
+
+    SnaptradeAccount::Processor.new(@snaptrade_account).process
+
+    @account.reload
+    assert_equal BigDecimal("15000.00"), @account.balance
+    assert_equal BigDecimal("1000.00"), @account.cash_balance
+    assert_equal "CHF", @account.currency
+  end
+
   # === ActivitiesProcessor Tests ===
 
   test "activities processor maps BUY type to Buy label" do