Remove final keyword from extensible classes to fix #25 (#26)

This change allows users to extend core classes for customization
purposes.

Modified classes (17 files):
- Core diagram classes: Graph, ERDiagram, ClassDiagram, Timeline
- Building blocks: Node, Link, Entity, Concept, Marker
- Component classes: EntityProperty, Attribute, Method, Event, Argument
- Structural classes: ConceptNamespace, Relationship
- Utility classes: Render

All tests pass (85 tests, 269 assertions).

Fixes #25

Author: SmetDenis

src/ClassDiagram/ClassDiagram.php

@@ -23,7 +23,10 @@
 use JBZoo\MermaidPHP\Helper;
 use JBZoo\MermaidPHP\Render;
 
-final class ClassDiagram
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class ClassDiagram
 {
     private ?string $title        = null;
     private ?Direction $direction = null;

src/ClassDiagram/Concept/Argument.php

@@ -16,7 +16,10 @@
 
 namespace JBZoo\MermaidPHP\ClassDiagram\Concept;
 
-final class Argument implements \Stringable
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Argument implements \Stringable
 {
     public function __construct(
         private string $name,

src/ClassDiagram/Concept/Attribute.php

@@ -16,7 +16,10 @@
 
 namespace JBZoo\MermaidPHP\ClassDiagram\Concept;
 
-final class Attribute implements \Stringable
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Attribute implements \Stringable
 {
     public function __construct(
         private string $name,

src/ClassDiagram/Concept/Concept.php

@@ -18,7 +18,10 @@
 
 use JBZoo\MermaidPHP\Helper;
 
-final class Concept
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Concept
 {
     private static bool $safeMode = false;
     private string    $identifier;

src/ClassDiagram/Concept/Method.php

@@ -18,7 +18,10 @@
 
 use JBZoo\MermaidPHP\Exception;
 
-final class Method implements \Stringable
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Method implements \Stringable
 {
     public function __construct(
         private string $name,

src/ClassDiagram/ConceptNamespace/ConceptNamespace.php

@@ -18,7 +18,10 @@
 
 use JBZoo\MermaidPHP\ClassDiagram\Concept\Concept;
 
-final class ConceptNamespace
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class ConceptNamespace
 {
     /**
      * @param Concept[] $classes

src/ClassDiagram/Relationship/Relationship.php

@@ -18,7 +18,10 @@
 
 use JBZoo\MermaidPHP\ClassDiagram\Concept\Concept;
 
-final class Relationship
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Relationship
 {
     public function __construct(
         private Concept $classA,

src/ERDiagram/ERDiagram.php

@@ -21,7 +21,10 @@
 use JBZoo\MermaidPHP\Helper;
 use JBZoo\MermaidPHP\Render;
 
-final class ERDiagram
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class ERDiagram
 {
     private const RENDER_SHIFT = 4;
 

src/ERDiagram/Entity/Entity.php

@@ -18,7 +18,10 @@
 
 use JBZoo\MermaidPHP\Helper;
 
-final class Entity
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class Entity
 {
     private static bool $safeMode = false;
     private string    $identifier = '';

src/ERDiagram/Entity/EntityProperty.php

@@ -16,7 +16,10 @@
 
 namespace JBZoo\MermaidPHP\ERDiagram\Entity;
 
-final class EntityProperty implements \Stringable
+/**
+ * @psalm-suppress ClassMustBeFinal
+ */
+class EntityProperty implements \Stringable
 {
     public const PRIMARY_KEY = 'PK';
     public const FOREIGN_KEY = 'FK';