Add Event entity, create event page, and custom WYSIWYG editor component

- Create Event entity with fields: account, title, description (text), startAt, endAt, address, zipcode, city, eventMainPicture (VichUploader), isOnline, createdAt, updatedAt
- Create EventRepository
- Add migration for event table with all columns
- Add "Creer un evenement" button on account events tab
- Add create event page (/mon-compte/evenement/creer) with full form
- Build custom web component <e-ticket-editor> WYSIWYG editor:
  - Toolbar: bold, italic, underline, paragraph, bullet list, remove formatting
  - contentEditable div with HTML sync to hidden textarea
  - HTML sanitizer (strips disallowed tags, XSS safe)
  - Neo-brutalist CSS styling
  - CSP compliant (no inline styles)
- Register editor in app.js via customElements.define
- Add editor CSS in app.scss
- Add 16 Event entity tests (all fields + isOnline + picture upload + updatedAt)
- Add 16 editor JS tests (sanitizer + custom element lifecycle)
- Add 3 AccountController tests (create event page, submit, access control)
- Update placeholders to generic examples (no association-specific data)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

migrations/Version20260320104445.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260320104445 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('CREATE TABLE event (id INT GENERATED BY DEFAULT AS IDENTITY NOT NULL, title VARCHAR(255) NOT NULL, start_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, end_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, description TEXT DEFAULT NULL, address VARCHAR(255) NOT NULL, zipcode VARCHAR(10) NOT NULL, city VARCHAR(255) NOT NULL, event_main_picture_name VARCHAR(255) DEFAULT NULL, is_online BOOLEAN NOT NULL DEFAULT false, created_at TIMESTAMP(0) WITHOUT TIME ZONE NOT NULL, updated_at TIMESTAMP(0) WITHOUT TIME ZONE DEFAULT NULL, account_id INT NOT NULL, PRIMARY KEY (id))');
+        $this->addSql('CREATE INDEX IDX_3BAE0AA79B6B5FBA ON event (account_id)');
+        $this->addSql('ALTER TABLE event ADD CONSTRAINT FK_3BAE0AA79B6B5FBA FOREIGN KEY (account_id) REFERENCES "user" (id) NOT DEFERRABLE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE event DROP CONSTRAINT FK_3BAE0AA79B6B5FBA');
+        $this->addSql('DROP TABLE event');
+    }
+}