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.

src/kleinanzeigen_bot/__init__.py

@@ -690,13 +690,13 @@ class KleinanzeigenBot(WebScrapingMixin):
                     await self.web_request(
                         url = f"{self.root_url}/m-anzeigen-loeschen.json?ids={published_ad_id}",
                         method = "POST",
-                        headers = {"x-csrf-token": csrf_token}
+                        headers = {"x-csrf-token": str(csrf_token)}
                     )
         elif ad_cfg.id:
             await self.web_request(
                 url = f"{self.root_url}/m-anzeigen-loeschen.json?ids={ad_cfg.id}",
                 method = "POST",
-                headers = {"x-csrf-token": csrf_token},
+                headers = {"x-csrf-token": str(csrf_token)},
                 valid_response_codes = [200, 404]
             )
 
@@ -1048,12 +1048,14 @@ class KleinanzeigenBot(WebScrapingMixin):
 
         LOG.debug("Found %i special attributes", len(ad_cfg.special_attributes))
         for special_attribute_key, special_attribute_value in ad_cfg.special_attributes.items():
+            # Ensure special_attribute_value is treated as a string
+            special_attribute_value_str = str(special_attribute_value)
 
             if special_attribute_key == "condition_s":
-                await self.__set_condition(special_attribute_value)
+                await self.__set_condition(special_attribute_value_str)
                 continue
 
-            LOG.debug("Setting special attribute [%s] to [%s]...", special_attribute_key, special_attribute_value)
+            LOG.debug("Setting special attribute [%s] to [%s]...", special_attribute_key, special_attribute_value_str)
             try:
                 # if the <select> element exists but is inside an invisible container, make the container visible
                 select_container_xpath = f"//div[@class='l-row' and descendant::select[@id='{special_attribute_key}']]"
@@ -1070,20 +1072,20 @@ class KleinanzeigenBot(WebScrapingMixin):
                 raise TimeoutError(f"Failed to set special attribute [{special_attribute_key}] (not found)") from ex
 
             try:
-                elem_id = special_attr_elem.attrs.id
+                elem_id:str = str(special_attr_elem.attrs.id)
                 if special_attr_elem.local_name == "select":
                     LOG.debug("Attribute field '%s' seems to be a select...", special_attribute_key)
-                    await self.web_select(By.ID, elem_id, special_attribute_value)
+                    await self.web_select(By.ID, elem_id, special_attribute_value_str)
                 elif special_attr_elem.attrs.type == "checkbox":
                     LOG.debug("Attribute field '%s' seems to be a checkbox...", special_attribute_key)
                     await self.web_click(By.ID, elem_id)
                 else:
                     LOG.debug("Attribute field '%s' seems to be a text input...", special_attribute_key)
-                    await self.web_input(By.ID, elem_id, special_attribute_value)
+                    await self.web_input(By.ID, elem_id, special_attribute_value_str)
             except TimeoutError as ex:
                 LOG.debug("Attribute field '%s' is not of kind radio button.", special_attribute_key)
                 raise TimeoutError(f"Failed to set special attribute [{special_attribute_key}]") from ex
-            LOG.debug("Successfully set attribute field [%s] to [%s]...", special_attribute_key, special_attribute_value)
+            LOG.debug("Successfully set attribute field [%s] to [%s]...", special_attribute_key, special_attribute_value_str)
 
     async def __set_shipping(self, ad_cfg:Ad, mode:AdUpdateStrategy = AdUpdateStrategy.REPLACE) -> None:
         if ad_cfg.shipping_type == "PICKUP":