fix: restore hassfest and Home Assistant CI

## Summary
- fix hassfest validation by replacing raw options-description URLs with Home Assistant translation placeholders
- extend the pytest CI matrix to cover the latest patch release for each Home Assistant month, plus dev
- align CI/dev container Python versions and tests with newer Home Assistant behavior

## Validation
- GitHub Actions pytest matrix passed for 2024.12.5 through 2026.4.3 plus dev
- Docker passed for linux/amd64 and linux/arm64
- hassfest, HACS validation, pre-commit, pre-commit.ci, markdown-code-runner, docs build, and Release Drafter passed

scripts/setup-dependencies

@@ -9,6 +9,30 @@ sed -i '/^mypy-dev/d' core/requirements_test.txt
 
 uv pip install -r core/requirements.txt
 uv pip install -r core/requirements_test.txt
+
+# HA 2026.4+ imports aiohasupervisor from tests/components/conftest.py
+# but pins it in requirements_test_all.txt instead of requirements_test.txt.
+aiohasupervisor_req=""
+if [[ -f core/requirements_test_all.txt ]]; then
+  aiohasupervisor_req="$(grep -m1 '^aiohasupervisor' core/requirements_test_all.txt || true)"
+fi
+if [[ -n "${aiohasupervisor_req}" ]]; then
+  uv pip install "${aiohasupervisor_req}"
+fi
+
+# HA 2026.4+ validates service translations through translations/en.json.
+# The core checkout keeps English source strings in strings.json, so seed en.json
+# in the temporary CI checkout before tests load integrations.
+for strings_file in core/homeassistant/components/*/strings.json; do
+  [[ -f "${strings_file}" ]] || continue
+  translations_dir="$(dirname "${strings_file}")/translations"
+  en_translation="${translations_dir}/en.json"
+  if [[ ! -f "${en_translation}" ]]; then
+    mkdir -p "${translations_dir}"
+    cp "${strings_file}" "${en_translation}"
+  fi
+done
+
 uv pip install -e core/
 uv pip install ulid-transform # this is in Adaptive-lighting's manifest.json
 uv pip install $(python test_dependencies.py)