fix: more nlreturn and testifylint issues

- Add blank lines before return statements
- Use require.Error instead of assert.Error for error assertions
- Keep exact float64 comparisons as-is (they are integers from JSON)

internal/secret/helpers.go

@@ -50,5 +50,6 @@ func DetermineStateDir(customConfigDir string) string {
 		homeDir, _ := os.UserHomeDir()
 		return filepath.Join(homeDir, ".config", AppID)
 	}
+
 	return filepath.Join(configDir, AppID)
 }