### Describe your changes. **Context:** When a remote build fails (or other framework-level errors occur), `craft-application` generates a documentation URL based on the application's base `docs_url`. Currently, this base URL is set to `https://documentation.ubuntu.com/snapcraft/{version}`. Because `{version}` resolves to strict patch versions (e.g., `9.0.0`), the generated URLs lead to 404 pages since the documentation site uses `stable` or major.minor routing (e.g., `9.0`). **Changes in this PR:** - Updated the root `docs_url` in `snapcraft/application.py` to use `stable` instead of `{version}`, bringing it in line with the rest of the hardcoded documentation URLs across the codebase and fixing broken links for users. Fixes #6300 --- - [x] I've followed the [contribution guidelines](https://github.com/canonical/snapcraft/blob/main/CONTRIBUTING.md). - [x] I've signed the [CLA](http://www.ubuntu.com/legal/contributors/). - [x] I've successfully run `make lint && make test`. - [ ] I've added or updated any relevant documentation. - [ ] In documents I changed, I [added a meta description](https://canonical-starflow.readthedocs-hosted.com/how-to/add-a-page-meta-description/) if one was missing. - [ ] I've updated the relevant release notes.