feat(auth): Amélioration UI et logique inscription parent étape 3

- Ajout du switch "Enfant à naître" et ajustement du champ prénom.

- Amélioration de la gestion de l'affichage des photos (placeholder, kIsWeb).

- Refactorisation des boutons avec HoverReliefWidget.

- Localisation du DatePicker en français.

- Nettoyage de l'intégration (annulée) de image_cropper.

- Mise à jour de EVOLUTIONS_CDC.md.

frontend/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,32 @@
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+
+        <!-- Suppression de l'activité pour image_cropper -->
+        <!-- 
+        <activity
+            android:name="com.yalantis.ucrop.UCropActivity"
+            android:screenOrientation="portrait"
+            android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
+        -->
+        
+        <!-- Don't delete the meta-data below. -->
+        <meta-data 

frontend/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java

@@ -0,0 +1,44 @@
+package io.flutter.plugins;
+
+import androidx.annotation.Keep;
+import androidx.annotation.NonNull;
+import io.flutter.Log;
+
+import io.flutter.embedding.engine.FlutterEngine;
+
+/**
+ * Generated file. Do not edit.
+ * This file is generated by the Flutter tool based on the
+ * plugins that support the Android platform.
+ */
+@Keep
+public final class GeneratedPluginRegistrant {
+  private static final String TAG = "GeneratedPluginRegistrant";
+  public static void registerWith(@NonNull FlutterEngine flutterEngine) {
+    try {
+      flutterEngine.getPlugins().add(new io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin flutter_plugin_android_lifecycle, io.flutter.plugins.flutter_plugin_android_lifecycle.FlutterAndroidLifecyclePlugin", e);
+    }
+    try {
+      flutterEngine.getPlugins().add(new io.flutter.plugins.imagepicker.ImagePickerPlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin image_picker_android, io.flutter.plugins.imagepicker.ImagePickerPlugin", e);
+    }
+    try {
+      flutterEngine.getPlugins().add(new io.flutter.plugins.pathprovider.PathProviderPlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin path_provider_android, io.flutter.plugins.pathprovider.PathProviderPlugin", e);
+    }
+    try {
+      flutterEngine.getPlugins().add(new io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin shared_preferences_android, io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin", e);
+    }
+    try {
+      flutterEngine.getPlugins().add(new io.flutter.plugins.urllauncher.UrlLauncherPlugin());
+    } catch (Exception e) {
+      Log.e(TAG, "Error registering plugin url_launcher_android, io.flutter.plugins.urllauncher.UrlLauncherPlugin", e);
+    }
+  }
+}

frontend/android/local.properties

@@ -0,0 +1 @@
+flutter.sdk=C:\\Users\\marti\\dev\\flutter