Fix asset provisioning to strip embedded share/radiantwave root

internal/assets/assets.go

@@ -11,6 +11,25 @@ import (
 	"path/filepath"
 )
 
+// embeddedRoot is the directory in the source tree (and therefore in the
+// embedded FS) where the bundled assets live. It mirrors the nix store
+// layout, but consumers expect the assets directly under the assets dir,
+// so this root is stripped during provisioning.
+const embeddedRoot = "share/radiantwave"
+
+// ProvisionAssets provisions the bundled static assets (fonts, shaders, and
+// terms-of-service pages) into destDir, stripping the embedded
+// share/radiantwave root so the files land directly in destDir rather than
+// in a nested share/radiantwave/ subdirectory. Existing files are
+// overwritten so the deployed assets always match the running binary.
+func ProvisionAssets(bundled fs.FS, destDir string) error {
+	root, err := fs.Sub(bundled, embeddedRoot)
+	if err != nil {
+		return fmt.Errorf("bundled assets missing %s root: %w", embeddedRoot, err)
+	}
+	return Provision(root, destDir)
+}
+
 // Provision copies every file from the embedded filesystem into destDir,
 // preserving the relative directory structure. Existing files are
 // overwritten so the deployed assets always match the running binary.