Add tests for uncategorized transaction filter across locales (#862)

* test: Add tests for uncategorized filter across all locales

Adds two tests to catch the bug where filtering for "Uncategorized"
transactions fails when the user's locale is not English:

1. Tests that filtering with the locale-specific uncategorized name
   works correctly in all SUPPORTED_LOCALES
2. Tests that filtering with the English "Uncategorized" parameter
   works regardless of the current locale (catches the French bug)

https://claude.ai/code/session_01JcKj4776k5Es8Cscbm4kUo

* fix: Fix uncategorized filter for French, Catalan, and Dutch locales

The uncategorized filter was failing when the URL parameter contained
"Uncategorized" (English) but the user's locale was different. This
affected 3 locales with non-English translations:
- French: "Non catégorisé"
- Catalan: "Sense categoria"
- Dutch: "Ongecategoriseerd"

The fix adds Category.all_uncategorized_names which returns all possible
uncategorized name translations across supported locales, and updates
the search filter to check against all variants instead of just the
current locale's translation.

https://claude.ai/code/session_01JcKj4776k5Es8Cscbm4kUo

---------

Co-authored-by: Claude <noreply@anthropic.com>

test/models/transaction/search_test.rb

@@ -494,4 +494,97 @@ class Transaction::SearchTest < ActiveSupport::TestCase
     # Should not match unrelated transactions
     assert_not_includes result_ids, no_match.entryable.id
   end
+
+  test "uncategorized filter returns same results across all supported locales" do
+    # Create uncategorized transactions
+    uncategorized1 = create_transaction(
+      account: @checking_account,
+      amount: 100,
+      kind: "standard"
+    )
+
+    uncategorized2 = create_transaction(
+      account: @checking_account,
+      amount: 200,
+      kind: "standard"
+    )
+
+    # Create a categorized transaction to ensure filter is working
+    categorized = create_transaction(
+      account: @checking_account,
+      amount: 300,
+      category: categories(:food_and_drink),
+      kind: "standard"
+    )
+
+    # Get the expected count using English locale (known working case)
+    I18n.with_locale(:en) do
+      english_uncategorized_name = Category.uncategorized.name
+      english_results = Transaction::Search.new(@family, filters: { categories: [ english_uncategorized_name ] }).transactions_scope
+      @expected_count = english_results.count
+      assert_equal 2, @expected_count, "English locale should return 2 uncategorized transactions"
+    end
+
+    # Test every supported locale returns the same count when filtering by that locale's uncategorized name
+    LanguagesHelper::SUPPORTED_LOCALES.each do |locale|
+      I18n.with_locale(locale) do
+        localized_uncategorized_name = Category.uncategorized.name
+        results = Transaction::Search.new(@family, filters: { categories: [ localized_uncategorized_name ] }).transactions_scope
+        result_count = results.count
+
+        assert_equal @expected_count, result_count,
+          "Locale '#{locale}' with uncategorized name '#{localized_uncategorized_name}' should return #{@expected_count} transactions but got #{result_count}"
+      end
+    end
+  end
+
+  test "uncategorized filter works with English parameter name regardless of current locale" do
+    # This tests the bug where URL contains English "Uncategorized" but user's locale is different
+    # Bug: /transactions/?q[categories][]=Uncategorized fails when locale is French
+
+    # Create uncategorized transactions
+    uncategorized1 = create_transaction(
+      account: @checking_account,
+      amount: 100,
+      kind: "standard"
+    )
+
+    uncategorized2 = create_transaction(
+      account: @checking_account,
+      amount: 200,
+      kind: "standard"
+    )
+
+    # Create a categorized transaction to ensure filter is working
+    categorized = create_transaction(
+      account: @checking_account,
+      amount: 300,
+      category: categories(:food_and_drink),
+      kind: "standard"
+    )
+
+    # Get the English uncategorized name (this is what URLs typically contain)
+    english_uncategorized_name = I18n.t("models.category.uncategorized", locale: :en)
+
+    # Get the expected count using English locale (known working case)
+    expected_count = nil
+    I18n.with_locale(:en) do
+      results = Transaction::Search.new(@family, filters: { categories: [ english_uncategorized_name ] }).transactions_scope
+      expected_count = results.count
+      assert_equal 2, expected_count, "English locale should return 2 uncategorized transactions"
+    end
+
+    # Test that using the English parameter name works in every supported locale
+    # This catches the bug where French locale fails with English "Uncategorized" parameter
+    LanguagesHelper::SUPPORTED_LOCALES.each do |locale|
+      I18n.with_locale(locale) do
+        # Simulate URL parameter: q[categories][]=Uncategorized (English, regardless of user's locale)
+        results = Transaction::Search.new(@family, filters: { categories: [ english_uncategorized_name ] }).transactions_scope
+        result_count = results.count
+
+        assert_equal expected_count, result_count,
+          "Locale '#{locale}' should return #{expected_count} transactions when filtering with English 'Uncategorized' parameter, but got #{result_count}"
+      end
+    end
+  end
 end