refactoring majeur (code dupliqué, mort, ...)

- Économie : ~1240 lignes de code dupliqué
- Réduction : ~60% du code modal
- Amélioration : Cohérence et maintenabilité

src/components/base/FormModal.tsx

@@ -0,0 +1,61 @@
+import { ReactNode } from 'react';
+import { Button } from '@/components/ui/button';
+import { BaseModal } from './BaseModal';
+import { ErrorDisplay } from './ErrorDisplay';
+
+interface FormModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onSubmit: (e: React.FormEvent) => Promise<void>;
+  title: string;
+  description?: string;
+  children: ReactNode;
+  loading: boolean;
+  error: string;
+  submitText: string;
+  loadingText?: string;
+  cancelText?: string;
+  maxWidth?: string;
+}
+
+export function FormModal({
+  isOpen,
+  onClose,
+  onSubmit,
+  title,
+  description,
+  children,
+  loading,
+  error,
+  submitText,
+  loadingText = "En cours...",
+  cancelText = "Annuler",
+  maxWidth = "sm:max-w-[500px]"
+}: FormModalProps) {
+  const footer = (
+    <>
+      <Button type="button" variant="outline" onClick={onClose} disabled={loading}>
+        {cancelText}
+      </Button>
+      <Button type="submit" disabled={loading} form="form-modal">
+        {loading ? loadingText : submitText}
+      </Button>
+    </>
+  );
+
+  return (
+    <BaseModal
+      isOpen={isOpen}
+      onClose={onClose}
+      title={title}
+      description={description}
+      footer={footer}
+      maxWidth={maxWidth}
+    >
+      <form id="form-modal" onSubmit={onSubmit} className="space-y-4">
+        <ErrorDisplay error={error} />
+        {children}
+      </form>
+    </BaseModal>
+  );
+}