Update CI, tooling, and project configuration

- Re-enable aardvark.co.nz in linkcheck workflow
- Update .gitignore
- Update pyproject.toml (deps, ruff config, etc.)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: tobixen

.github/workflows/linkcheck.yml

@@ -12,7 +12,7 @@ jobs:
       with:
         fail: true
         args: >-
-          --timeout 10
-          --max-retries 2
+          --timeout 20
+          --max-retries 3
           '**/*.md'
           '**/*.rst'

.gitignore

@@ -32,3 +32,5 @@ tests/docker-test-servers/baikal/baikal-backup/
 tests/docker-test-servers/*/baikal-backup/
 # But keep the pre-configured Specific directory for Baikal
 !tests/docker-test-servers/baikal/Specific/
+# Local test server configuration (may contain credentials)
+tests/caldav_test_servers.yaml

pyproject.toml

@@ -160,6 +160,9 @@ filterwarnings = [
     # Treat all warnings as errors by default
     "error",
 
+    # Allow missing _version.py warning during development/testing (generated by hatch-vcs on build/install)
+    "ignore:You need to install the `build` package:UserWarning",
+
     # Ignore deprecation warnings from external libraries we can't control
     # https://github.com/jawah/niquests/pull/327 https://github.com/jawah/niquests/issues/326
     "ignore:.*asyncio.iscoroutinefunction.*:DeprecationWarning:niquests",
@@ -171,4 +174,10 @@ filterwarnings = [
 
     # Radicale uses deprecated importlib.abc.Traversable (Python 3.14 removal)
     "ignore:.*importlib.abc.Traversable.*:DeprecationWarning",
+
+    # Show conf_private.py deprecation warning once (not as error) during migration period
+    "once:conf_private.py is deprecated:DeprecationWarning",
+
+    # Zimbra test server uses HTTPS with self-signed cert (ssl_verify_cert=False)
+    "ignore:Unverified HTTPS request:urllib3_future.exceptions.InsecureRequestWarning",
 ]