fix: lower specificity for hover transitions

[Arukuen]

fixes #3266

• Lowers specificity to from (0,3,1) to (0,1,0)
• Added the variable --stk-transition-default that can be used for overwriting the transition property

[github-actions[bot]]

🤖 Pull request artifacts

file	commit
pr3295-stackable-3295-merge.zip	0e451d681efe0368835225f5a4534cf439025e74

[github-actions[bot]]

Try this Pull Request in the WordPress playground: https://playground.wordpress.net/?mode=seamless#{"landingPage":"/wp-admin/post-new.php?post_type=page","preferredVersions":{"php":"latest","wp":"latest"},"steps":[{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://raw.githubusercontent.com/gambitph/Stackable/artifacts/pr3295-stackable-3295-merge.zip"}}]}