feat: ssr support for <style vars>

packages/server-renderer/src/helpers/ssrResolveCssVars.ts

@@ -0,0 +1,11 @@
+export function ssrResolveCssVars(
+  source: Record<string, string>,
+  scopeId?: string
+) {
+  const style: Record<string, string> = {}
+  const prefix = scopeId ? `${scopeId.replace(/^data-v-/, '')}-` : ``
+  for (const key in source) {
+    style[`--${prefix}${key}`] = source[key]
+  }
+  return { style }
+}