feat: add configurable timeouts (#673)

## ℹ️ Description
- Related issues: #671, #658
- Introduces configurable timeout controls plus retry/backoff handling
for flaky DOM operations.

We often see timeouts which are note reproducible in certain
configurations. I suspect timeout issues based on a combination of
internet speed, browser, os, age of the computer and the weather.

This PR introduces a comprehensive config model to tweak timeouts.

## 📋 Changes Summary
- add TimeoutConfig to the main config/schema and expose timeouts in
README/docs
- wire WebScrapingMixin, extractor, update checker, and browser
diagnostics to honor the configurable timeouts and retries
- update translations/tests to cover the new behaviour and ensure
lint/mypy/pyright pipelines remain green

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

## ✅ Checklist
- [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.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Centralized, configurable timeout system for web interactions,
detection flows, publishing, and pagination.
* Optional retry with exponential backoff for operations that time out.

* **Improvements**
* Replaced fixed wait times with dynamic timeouts throughout workflows.
  * More informative timeout-related messages and diagnostics.

* **Tests**
* New and expanded test coverage for timeout behavior, pagination,
diagnostics, and retry logic.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

README.md

@@ -277,6 +277,27 @@ categories:
   Verschenken & Tauschen > Verleihen: 272/274
   Verschenken & Tauschen > Verschenken: 272/192
 
+# timeout tuning (optional)
+timeouts:
+  multiplier: 1.0                     # Scale all timeouts (e.g. 2.0 for slower networks)
+  default: 5.0                        # Base timeout for web_find/web_click/etc.
+  page_load: 15.0                     # Timeout for web_open page loads
+  captcha_detection: 2.0              # Timeout for captcha iframe detection
+  sms_verification: 4.0               # Timeout for SMS verification banners
+  gdpr_prompt: 10.0                   # Timeout when handling GDPR dialogs
+  publishing_result: 300.0            # Timeout for publishing status checks
+  publishing_confirmation: 20.0       # Timeout for publish confirmation redirect
+  pagination_initial: 10.0            # Timeout for first pagination lookup
+  pagination_follow_up: 5.0           # Timeout for subsequent pagination clicks
+  quick_dom: 2.0                      # Generic short DOM timeout (shipping dialogs, etc.)
+  update_check: 10.0                  # Timeout for GitHub update requests
+  chrome_remote_probe: 2.0            # Timeout for local remote-debugging probes
+  chrome_remote_debugging: 5.0        # Timeout for remote debugging API calls
+  chrome_binary_detection: 10.0       # Timeout for chrome --version subprocess
+  retry_enabled: true                 # Enables DOM retry/backoff when timeouts occur
+  retry_max_attempts: 2
+  retry_backoff_factor: 1.5
+
 # download configuration
 download:
   include_all_matching_shipping_options: false  # if true, all shipping options matching the package size will be included
@@ -329,6 +350,8 @@ login:
   password: ""
 ```
 
+Slow networks or sluggish remote browsers often just need a higher `timeouts.multiplier`, while truly problematic selectors can get explicit values directly under `timeouts`. Remember to regenerate the schemas after changing the configuration model so editors stay in sync.
+
 ### <a name="ad-config"></a>2) Ad configuration
 
 Each ad is described in a separate JSON or YAML file with prefix `ad_<filename>`. The prefix is configurable in config file.