style: remove hyphens from compound adjectives in comments and messages

Remove hyphens from compound adjectives such as "logged-in", "one-time", "password-protected", "full-height", "multi-file", and "S3-compatible" in comments, test error messages, and UI labels to improve readability and consistency.

backend/libs/services/auth_test.go

@@ -118,7 +118,7 @@ func TestAPITokenLifecycle(t *testing.T) {
 	if result.Plaintext == "" || !strings.HasPrefix(result.Plaintext, apiTokenPrefix) {
 		t.Fatalf("plaintext = %q, want %q prefix", result.Plaintext, apiTokenPrefix)
 	}
-	// The secret must never be stored in plaintext — only its hash.
+	// The secret must never be stored in plaintext. only its hash.
 	if strings.Contains(result.Token.TokenHash, result.Plaintext) || result.Token.TokenHash == result.Plaintext {
 		t.Fatalf("stored token hash leaks the plaintext secret")
 	}