Fix vendor mixin issues in Sass - use standard CSS transforms

Replace @include vendor() calls with standard CSS for transform and animation properties. These don't need vendor prefixes in modern browsers and were causing undefined mixin errors.

- _page.scss: Use standard animation/transition
- _hero.scss: Use standard transform
- _scroll-reveal.scss: Use standard transform

Build now compiles successfully without errors (warnings are from HTML5UP legacy libs only).

Co-Authored-By: Claude Haiku 4.5 <redacted>

diff --git a/themes/dagreynix b/themes/dagreynix
index 8f0d436e7bbc18f3c1e69ac58f6236323146910f..edfd419c80e6a3f98e83280bc1862b71a77925fe 160000 (submodule)
--- a/themes/dagreynix
+++ b/themes/dagreynix
@@ -1 +1 @@
-Subproject commit 8f0d436e7bbc18f3c1e69ac58f6236323146910f
+Subproject commit edfd419c80e6a3f98e83280bc1862b71a77925fe