test: convert tests to pytest assertions; add server-availability skips; clean up warnings and minor syntax/indent issues

RELEASE_NOTES_TEMPLATE.md

@@ -1,11 +1,14 @@
 # MTG Python Deckbuilder ${VERSION}
 
+### Added
+- CI improvements to increase stability and reproducibility of builds/tests.
+- Expanded test coverage for validation and web flows.
+
 ### Changed
-- Web UI: Test Hand uses a default fanned layout on desktop with tightened arc and 40% overlap; outer cards sit lower for a full-arc look
-- Desktop Test Hand card size set to 280×392; responsive sizes refined at common breakpoints
-- Theme controls moved from the top banner to the bottom of the left sidebar; sidebar made a flex column with the theme block anchored at the bottom
-- Mobile banner simplified to show only Menu, title; spacing and gaps tuned to prevent overflow and wrapping
+- Tests refactored to use pytest assertions and streamlined fixtures/utilities to reduce noise and deprecations.
+- HTTP-dependent tests skip gracefully when the local web server is unavailable.
 
 ### Fixed
-- Prevented mobile banner overflow by hiding non-essential items and relocating theme controls
-- Ensured desktop sizing wins over previous inline styles by using global CSS overrides; cards no longer shrink due to flexbox constraints
+- Reduced deprecation warnings and incidental test failures; improved consistency across runs.
+
+---