fix: type-switch capture, nil guard, LastInsertId error check

Three defensive fixes: 1) whatsapp_native - use type-switch capture instead of redundant unchecked assertion 2) config - add nil receiver guard to FilterSensitiveData 3) seahorse/store - check LastInsertId error in 3 locations

pkg/config/config.go

@@ -194,6 +194,9 @@ type ExposePath struct {
 // Uses strings.Replacer for O(n+m) performance (computed once per SecurityConfig).
 // Short content (below FilterMinLength) is returned unchanged for performance.
 func (c *Config) FilterSensitiveData(content string) string {
+	if c == nil {
+		return content
+	}
 	// Check if filtering is enabled (default: true)
 	if !c.Tools.IsFilterSensitiveDataEnabled() {
 		return content