Skip hassfest MDI icon generation on an outdated frontend (#179781)

Co-authored-by: Claude <noreply@anthropic.com>

script/hassfest/mdi_icons.py

@@ -8,6 +8,7 @@ from .model import Config, Integration
 from .serializer import format_python_namespace
 
 _TARGET = "pylint/plugins/pylint_home_assistant/generated/mdi_icons.py"
+_REQUIREMENT_PREFIX = "home-assistant-frontend=="
 
 
 def _get_frontend_version() -> str | None:
@@ -18,6 +19,14 @@ def _get_frontend_version() -> str | None:
         return None
 
 
+def _get_pinned_frontend_version(integrations: dict[str, Integration]) -> str | None:
+    """Get the home-assistant-frontend version pinned in the frontend manifest."""
+    for requirement in integrations["frontend"].requirements:
+        if requirement.startswith(_REQUIREMENT_PREFIX):
+            return requirement.removeprefix(_REQUIREMENT_PREFIX)
+    return None
+
+
 def _load_mdi_icons() -> set[str]:
     """Load the MDI icon names from the frontend package."""
     try:
@@ -35,6 +44,10 @@ def validate(integrations: dict[str, Integration], config: Config) -> None:
     if frontend_version is None:
         return
 
+    pinned_version = _get_pinned_frontend_version(integrations)
+    if pinned_version is not None and pinned_version != frontend_version:
+        return
+
     icons = _load_mdi_icons()
     if not icons:
         config.add_error(