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 -->

CONTRIBUTING.md

@@ -187,6 +187,14 @@ All Python files must start with SPDX license headers:
 - Use appropriate log levels (DEBUG, INFO, WARNING, ERROR)
 - Log important state changes and decision points
 
+#### Timeout configuration
+- The default timeout (`timeouts.default`) already wraps all standard DOM helpers (`web_find`, `web_click`, etc.) via `WebScrapingMixin._timeout/_effective_timeout`. Use it unless a workflow clearly needs a different SLA.
+- Reserve `timeouts.quick_dom` for transient overlays (shipping dialogs, payment prompts, toast banners) that should render almost instantly; call `self._timeout("quick_dom")` in those spots to keep the UI responsive.
+- For single selectors that occasionally need more headroom, pass an inline override instead of creating a new config key, e.g. `custom = self._timeout(override = 12.5); await self.web_find(..., timeout = custom)`.
+- Use `_timeout()` when you just need the raw configured value (with optional override); use `_effective_timeout()` when you rely on the global multiplier and retry backoff for a given attempt (e.g. inside `_run_with_timeout_retries`).
+- Add a new timeout key only when a recurring workflow has its own timing profile (pagination, captcha detection, publishing confirmations, Chrome probes, etc.). Whenever you add one, extend `TimeoutConfig`, document it in the sample `timeouts:` block in `README.md`, and explain it in `docs/BROWSER_TROUBLESHOOTING.md`.
+- Encourage users to raise `timeouts.multiplier` when everything is slow, and override existing keys in `config.yaml` before introducing new ones. This keeps the configuration surface minimal.
+
 #### Examples
 ```python
 def parse_duration(text: str) -> timedelta:
@@ -297,4 +305,3 @@ See the [LICENSE.txt](LICENSE.txt) file for our project's licensing. All source
 - Use the translation system for all output—**never hardcode German or other languages** in the code.
 - If you add or change a user-facing message, update the translation file and ensure that translation completeness tests pass (`tests/unit/test_translations.py`).
 - Review the translation guidelines and patterns in the codebase for correct usage.
-