feat: upgrade nodriver from 0.39 to 0.47 (#635)

## ℹ️ Description
Upgrade nodriver dependency from pinned version 0.39.0 to latest 0.47.0
to resolve browser startup issues and JavaScript evaluation problems
that affected versions 0.40-0.44.

- Link to the related issue(s): Resolves nodriver compatibility issues
- This upgrade addresses browser startup problems and window.BelenConf
evaluation failures that were blocking the use of newer nodriver
versions.

## 📋 Changes Summary

- Updated nodriver dependency from pinned 0.39.0 to >=0.47.0 in
pyproject.toml
- Fixed RemoteObject handling in web_execute method for nodriver 0.47
compatibility
- Added comprehensive BelenConf test fixture with real production data
structure
- Added integration test to validate window.BelenConf evaluation works
correctly
- Added German translation for new error message
- Replaced real user data with privacy-safe dummy data in test fixtures

### 🔧 Type Safety Improvements

**Added explicit `str()` conversions to resolve type inference issues:**

The comprehensive BelenConf test fixture contains deeply nested data
structures that caused pyright's type checker to infer complex
dictionary types throughout the codebase. To ensure type safety and
prevent runtime errors, I added explicit `str()` conversions in key
locations:

- **CSRF tokens**: `str(csrf_token)` - Ensures CSRF tokens are treated
as strings
- **Special attributes**: `str(special_attribute_value)` - Converts
special attribute values to strings
- **DOM attributes**: `str(special_attr_elem.attrs.id)` - Ensures
element IDs are strings
- **URL handling**: `str(current_img_url)` and `str(href_attributes)` -
Converts URLs and href attributes to strings
- **Price values**: `str(ad_cfg.price)` - Ensures price values are
strings

These conversions are defensive programming measures that ensure
backward compatibility and prevent type-related runtime errors, even if
the underlying data structures change in the future.

### ⚙️ Type of Change
- [x] ✨ New feature (adds new functionality without breaking existing
usage)
- [ ] 🐞 Bug fix (non-breaking change which fixes an issue)
- [ ] 💥 Breaking change (changes that might break existing user setups,
scripts, or configurations)

## ✅ Checklist
Before requesting a review, confirm the following:
- [x] I have reviewed my changes to ensure they meet the project's
standards.
- [x] I have tested my changes and ensured that all tests pass (`pdm run
test`).
- [x] I have formatted the code (`pdm run format`).
- [x] I have verified that linting passes (`pdm run lint`).
- [x] I have updated documentation where necessary.

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

tests/unit/test_extract.py

@@ -587,6 +587,31 @@ class TestAdExtractorCategory:
             mock_web_find.assert_any_call(By.CSS_SELECTOR, "a:nth-of-type(2)", parent = category_line)
             mock_web_find.assert_any_call(By.CSS_SELECTOR, "a:nth-of-type(3)", parent = category_line)
 
+    @pytest.mark.asyncio
+    # pylint: disable=protected-access
+    async def test_extract_category_with_non_string_href(self, extractor:AdExtractor) -> None:
+        """Test category extraction with non-string href attributes to cover str() conversion."""
+        category_line = MagicMock()
+        first_part = MagicMock()
+        # Use non-string href to test str() conversion
+        first_part.attrs = {"href": 12345}  # This will need str() conversion
+        second_part = MagicMock()
+        second_part.attrs = {"href": 67890}  # This will need str() conversion
+
+        with patch.object(extractor, "web_find", new_callable = AsyncMock) as mock_web_find:
+            mock_web_find.side_effect = [
+                category_line,
+                first_part,
+                second_part
+            ]
+
+            result = await extractor._extract_category_from_ad_page()
+            assert result == "2345/7890"  # After str() conversion and slicing
+
+            mock_web_find.assert_any_call(By.ID, "vap-brdcrmb")
+            mock_web_find.assert_any_call(By.CSS_SELECTOR, "a:nth-of-type(2)", parent = category_line)
+            mock_web_find.assert_any_call(By.CSS_SELECTOR, "a:nth-of-type(3)", parent = category_line)
+
     @pytest.mark.asyncio
     # pylint: disable=protected-access
     async def test_extract_special_attributes_empty(self, extractor:AdExtractor) -> None: