feat: deploy autonomous French web edition for Joy

Add FUNDING.yml

.dockerignore

@@ -0,0 +1,7 @@
+.git
+.github
+.godot
+dist
+addons/godot-sqlite/bin
+*.log
+.DS_Store

.github/FUNDING.yml

@@ -0,0 +1,15 @@
+# These are supported funding model platforms
+
+github: [Excello-Recherche-Education] # Up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+# patreon: # Replace with a single Patreon username
+# open_collective: # Replace with a single Open Collective username
+# ko_fi: # Replace with a single Ko-fi username
+# tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+# community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+# liberapay: # Replace with a single Liberapay username
+# issuehunt: # Replace with a single IssueHunt username
+# lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
+# polar: # Replace with a single Polar username
+# buy_me_a_coffee: # Replace with a single Buy Me a Coffee username
+# thanks_dev: # Replace with a single thanks.dev username
+# custom: # Up to 4 custom URLs e.g., [link1, link2]

Dockerfile

@@ -0,0 +1,66 @@
+# syntax=docker/dockerfile:1.7
+
+ARG GODOT_VERSION=4.6.3
+
+FROM ubuntu:24.04 AS web-builder
+ARG GODOT_VERSION
+ARG SQLITE_VERSION=4.8
+ARG TARGETARCH
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends ca-certificates curl libfontconfig1 unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN case "$TARGETARCH" in \
+        amd64) GODOT_ARCH="x86_64" ;; \
+        arm64) GODOT_ARCH="arm64" ;; \
+        *) echo "Unsupported build architecture: $TARGETARCH" >&2; exit 1 ;; \
+    esac \
+    && curl -fsSL "https://github.com/godotengine/godot/releases/download/${GODOT_VERSION}-stable/Godot_v${GODOT_VERSION}-stable_linux.${GODOT_ARCH}.zip" -o /tmp/godot.zip \
+    && unzip -q /tmp/godot.zip -d /usr/local/bin \
+    && mv "/usr/local/bin/Godot_v${GODOT_VERSION}-stable_linux.${GODOT_ARCH}" /usr/local/bin/godot \
+    && chmod +x /usr/local/bin/godot \
+    && mkdir -p "/root/.local/share/godot/export_templates/${GODOT_VERSION}.stable" \
+    && curl -fsSL "https://github.com/godotengine/godot/releases/download/${GODOT_VERSION}-stable/Godot_v${GODOT_VERSION}-stable_export_templates.tpz" -o /tmp/templates.tpz \
+    && unzip -q /tmp/templates.tpz -d /tmp/godot-templates \
+    && mv /tmp/godot-templates/templates/* "/root/.local/share/godot/export_templates/${GODOT_VERSION}.stable/" \
+    && rm -rf /tmp/godot.zip /tmp/templates.tpz /tmp/godot-templates
+
+WORKDIR /src
+COPY . .
+
+RUN mkdir -p addons/godot-sqlite/bin \
+    && curl -fsSL "https://github.com/2shady4u/godot-sqlite/releases/download/v${SQLITE_VERSION}/addons.zip" -o /tmp/godot-sqlite.zip \
+    && unzip -j /tmp/godot-sqlite.zip \
+        'addons/godot-sqlite/bin/libgdsqlite.web.template_release.wasm32.wasm' \
+        -d addons/godot-sqlite/bin \
+    && rm /tmp/godot-sqlite.zip \
+    && find assets -type f -name '*.import' -exec sed -i 's|^compress/mode=2$|compress/mode=0|' {} +
+
+RUN mkdir -p dist \
+    && godot --headless --path /src --import \
+    && find .godot/imported -name 'title.png-*.ctex' ! -name '*.etc2.ctex' ! -name '*.s3tc.ctex' -type f -size +0c | grep -q . \
+    && find .godot/imported -name 'kalulu_sprite_sheet.png-*.ctex' ! -name '*.etc2.ctex' ! -name '*.s3tc.ctex' -type f -size +0c | grep -q .
+
+RUN godot --headless --path /src --export-release "Web Test" dist/index.html \
+    && mv dist/index.pck dist/index-3.0.1-fr-joy.pck \
+    && sed -i 's|"index.pck":|"index-3.0.1-fr-joy.pck":|; s|"focusCanvas":true,|"focusCanvas":true,"mainPack":"index-3.0.1-fr-joy.pck",|' dist/index.html \
+    && test -s dist/index.html \
+    && test -s dist/index.wasm \
+    && test -s dist/index-3.0.1-fr-joy.pck
+
+FROM alpine:3.22 AS french-content
+ARG FRENCH_PACK_VERSION=v20260615-9e5d0d4
+RUN apk add --no-cache ca-certificates curl \
+    && mkdir -p /content \
+    && curl -fsSL "https://github.com/Excello-Recherche-Education/Kalulu-Languages/releases/download/${FRENCH_PACK_VERSION}/fr_FR.zip" -o /content/fr_FR.zip \
+    && test -s /content/fr_FR.zip
+
+FROM nginx:1.29.1-alpine AS runtime
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=web-builder /src/dist/ /usr/share/nginx/html/
+COPY --from=french-content /content/fr_FR.zip /usr/share/nginx/html/content/fr_FR.zip
+
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -q -O /dev/null http://127.0.0.1:8080/healthz || exit 1

README.fr.md

@@ -2,6 +2,23 @@
 
 # 📖 Kalulu — Apprends à lire intelligemment
 
+## Version Web Docker autonome — Joy
+
+Cette variante déploie Kalulu en français sur `https://kalulu.agendx.ch` avec un profil local **Joy**, 5 ans, niveau débutant (Grande Section). Elle n’utilise pas l’API officielle de Kalulu : le pack `fr_FR` est servi par la même image et la progression reste dans le stockage IndexedDB du navigateur.
+
+Prérequis : Docker avec BuildKit, un réseau Docker externe `traefik_proxy` et un Traefik fournissant HTTPS.
+
+```bash
+docker network inspect traefik_proxy >/dev/null 2>&1 || docker network create traefik_proxy
+docker compose build kalulu
+docker compose up -d kalulu
+./scripts/verify-live.sh
+```
+
+Le premier lancement charge environ 34 Mo d’application puis télécharge 66 Mo de contenu pédagogique depuis la même origine. Le pack est ensuite extrait et conservé localement ; cette première installation peut prendre quelques minutes. Effacer les données du site dans le navigateur réinitialise le profil et la progression.
+
+L’image construit l’export avec Godot 4.6.3, les modèles d’export officiels et Godot-SQLite 4.8 (la version compilée pour Godot 4.6.3). Nginx sert WebAssembly avec les en-têtes COOP/COEP requis pour les threads.
+
 ## 🌍 Langues disponibles
 
 - 🇬🇧 [English](README.md)
@@ -126,4 +143,4 @@ Oui ! Des versions pour Windows, Mac et Linux sont disponibles dans la section [
 
 ### 🌐 Kalulu est-il disponible directement sur le web ?
 
-Nous y travaillons, restez à l’écoute !
+Oui, cette variante autonome est disponible sur [kalulu.agendx.ch](https://kalulu.agendx.ch).

compose.yaml

@@ -0,0 +1,25 @@
+services:
+  kalulu:
+    image: kalulu-web:3.0.1-fr-joy
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: kalulu-web
+    restart: unless-stopped
+    networks:
+      - traefik_proxy
+    labels:
+      - traefik.enable=true
+      - traefik.docker.network=traefik_proxy
+      - traefik.http.routers.kalulu.rule=Host(`kalulu.agendx.ch`)
+      - traefik.http.routers.kalulu.entrypoints=websecure
+      - traefik.http.routers.kalulu.tls=true
+      - traefik.http.routers.kalulu.tls.certresolver=myresolver
+      - traefik.http.routers.kalulu.middlewares=crowdsec-bouncer@docker
+      - traefik.http.services.kalulu.loadbalancer.server.port=8080
+    security_opt:
+      - no-new-privileges:true
+
+networks:
+  traefik_proxy:
+    external: true

export_presets.cfg

@@ -38,7 +38,7 @@ architectures/armeabi-v7a=false
 architectures/arm64-v8a=true
 architectures/x86=false
 architectures/x86_64=false
-version/code=78
+version/code=79
 version/name=""
 package/unique_name="org.godotengine.kalulu"
 package/name="Kalulu"
@@ -264,7 +264,7 @@ architectures/armeabi-v7a=false
 architectures/arm64-v8a=true
 architectures/x86=false
 architectures/x86_64=false
-version/code=78
+version/code=79
 version/name=""
 package/unique_name="org.godotengine.kalulu"
 package/name="Kalulu"
@@ -490,7 +490,7 @@ architectures/armeabi-v7a=true
 architectures/arm64-v8a=false
 architectures/x86=false
 architectures/x86_64=false
-version/code=78
+version/code=79
 version/name=""
 package/unique_name="org.godotengine.kalulu"
 package/name="Kalulu"
@@ -1360,7 +1360,7 @@ custom_features=""
 export_filter="all_resources"
 include_filter=""
 exclude_filter=""
-export_path="../Export/web/Kalulu.html"
+export_path="dist/index.html"
 patches=PackedStringArray()
 patch_delta_encoding=false
 patch_delta_compression_level_zstd=19
@@ -1378,9 +1378,9 @@ script_export_mode=2
 
 custom_template/debug=""
 custom_template/release=""
-variant/extensions_support=false
+variant/extensions_support=true
 variant/thread_support=true
-vram_texture_compression/for_desktop=true
+vram_texture_compression/for_desktop=false
 vram_texture_compression/for_mobile=false
 html/export_icon=true
 html/custom_html_shell=""

nginx.conf

@@ -0,0 +1,58 @@
+server {
+    listen 8080;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    add_header Cross-Origin-Opener-Policy "same-origin" always;
+    add_header Cross-Origin-Embedder-Policy "require-corp" always;
+    add_header Cross-Origin-Resource-Policy "same-origin" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "no-referrer" always;
+
+    default_type application/octet-stream;
+    types {
+        text/html html;
+        text/css css;
+        application/javascript js;
+        application/wasm wasm;
+        application/json json;
+        image/png png;
+        image/svg+xml svg;
+        image/x-icon ico;
+        application/zip zip;
+    }
+
+    location = /healthz {
+        access_log off;
+        return 204;
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-cache" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Resource-Policy "same-origin" always;
+        try_files $uri =404;
+    }
+
+    location /content/ {
+        add_header Cache-Control "public, max-age=31536000, immutable" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Resource-Policy "same-origin" always;
+        try_files $uri =404;
+    }
+
+    location ~* \.(wasm|pck|js)$ {
+        add_header Cache-Control "public, max-age=31536000, immutable" always;
+        add_header Cross-Origin-Opener-Policy "same-origin" always;
+        add_header Cross-Origin-Embedder-Policy "require-corp" always;
+        add_header Cross-Origin-Resource-Policy "same-origin" always;
+        try_files $uri =404;
+    }
+
+    location / {
+        try_files $uri $uri/ =404;
+    }
+}

project.godot

@@ -23,6 +23,7 @@ boot_splash/bg_color=Color(0.141176, 0.141176, 0.141176, 1)
 config/icon="res://assets/kalulu_icon.png"
 custom/unlock_everything=false
 custom/unlock_everything.debug=false
+custom/local_web_mode=true
 
 [audio]
 
@@ -36,6 +37,7 @@ Globals="*res://sources/language_tool/globals.gd"
 LessonLogger="*res://sources/utils/autoloads/lesson_logger.gd"
 MusicManager="*res://sources/utils/autoloads/music_manager.tscn"
 OpeningCurtain="*res://sources/utils/autoloads/opening_curtain.tscn"
+SceneLoader="*res://sources/utils/autoloads/scene_loader.gd"
 ServerManager="*res://sources/utils/autoloads/server_manager.tscn"
 UnicodeNormalizer="*res://sources/utils/autoloads/unicode_normalizer.gd"
 UserDataManager="*res://sources/utils/autoloads/user_data_manager.gd"

scripts/verify-live.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+set -eu
+
+BASE_URL="${1:-https://kalulu.agendx.ch}"
+HEADERS="$(mktemp)"
+trap 'rm -f "$HEADERS"' EXIT
+
+curl -fsS -D "$HEADERS" -o /dev/null "$BASE_URL/"
+grep -qi '^cross-origin-opener-policy: same-origin' "$HEADERS"
+grep -qi '^cross-origin-embedder-policy: require-corp' "$HEADERS"
+curl -fsS -o /dev/null "$BASE_URL/index.wasm"
+curl -fsS -r 0-1023 -o /dev/null "$BASE_URL/content/fr_FR.zip"
+
+printf 'Kalulu Web OK: %s\n' "$BASE_URL"

sources/gardens/gardens.gd

@@ -20,21 +20,25 @@ const LESSON_BUTTON_OUTLINE_RADIUS: float = 192.0
 # button center, mirroring the movie icon just above it. The 384x384 button has
 # its center at y=192; the label (vertical-centered) then centers at y=(this+384)/2.
 const LESSON_BUTTON_LABEL_TOP_OFFSET: float = 104.0
-const GARDEN_SCENES: Array[PackedScene] = [
-	preload("res://resources/gardens/garden_01.tscn"),
-	preload("res://resources/gardens/garden_02.tscn"),
-	preload("res://resources/gardens/garden_03.tscn"),
-	preload("res://resources/gardens/garden_04.tscn"),
-	preload("res://resources/gardens/garden_05.tscn"),
-	preload("res://resources/gardens/garden_06.tscn"),
-	preload("res://resources/gardens/garden_07.tscn"),
-	preload("res://resources/gardens/garden_08.tscn"),
-	preload("res://resources/gardens/garden_09.tscn"),
-	preload("res://resources/gardens/garden_10.tscn"),
-	preload("res://resources/gardens/garden_11.tscn"),
-	preload("res://resources/gardens/garden_12.tscn"),
+# Loaded on demand instead of preloaded: this script never unloads (it has
+# static variables), so preloaded constants would pin every garden's assets in
+# memory for the whole app lifetime — including while minigames run, which
+# OOM-crashes low-memory devices.
+const GARDEN_SCENE_PATHS: Array[String] = [
+	"res://resources/gardens/garden_01.tscn",
+	"res://resources/gardens/garden_02.tscn",
+	"res://resources/gardens/garden_03.tscn",
+	"res://resources/gardens/garden_04.tscn",
+	"res://resources/gardens/garden_05.tscn",
+	"res://resources/gardens/garden_06.tscn",
+	"res://resources/gardens/garden_07.tscn",
+	"res://resources/gardens/garden_08.tscn",
+	"res://resources/gardens/garden_09.tscn",
+	"res://resources/gardens/garden_10.tscn",
+	"res://resources/gardens/garden_11.tscn",
+	"res://resources/gardens/garden_12.tscn",
 ]
-const LOOK_AND_LEARN_SCENE: PackedScene = preload("res://sources/look_and_learn/look_and_learn.tscn")
+const LOOK_AND_LEARN_SCENE_PATH: String = "res://sources/look_and_learn/look_and_learn.tscn"
 const BOSS_BUTTON_SCENE: PackedScene = preload("res://sources/gardens/boss_button.tscn")
 const BOSS_MINIGAME_SCENE_PATH: String = "res://sources/minigames/boss/boss_minigame.tscn"
 const GARDEN_SIZE: int = 2400
@@ -71,7 +75,6 @@ static var cached_layout_lessons: int = 0
 @export var minigames_body_icons: Array[Texture] = []
 @export var minigames_face_icons: Array[Texture] = []
 
-var _minigame_scene_cache: Dictionary = {}
 var lessons: Dictionary = {}
 var _gardens_layout: GardensLayout
 var points: Array[Array] = []
@@ -988,20 +991,13 @@ func _lesson_button_label_color(status: StudentProgression.Status) -> Color:
 	return lesson_button.unlocked_label_color
 
 
-func _get_minigame_scene(scene_index: int) -> PackedScene:
+func _get_minigame_scene_path(scene_index: int) -> String:
 	if scene_index < 0 or scene_index >= minigame_scene_paths.size():
-		return null
-	if _minigame_scene_cache.has(scene_index):
-		return _minigame_scene_cache[scene_index] as PackedScene
+		return ""
 	var scene_path: String = minigame_scene_paths[scene_index]
-	if scene_path.is_empty():
-		return null
-	var scene_resource: Resource = load(scene_path)
-	if scene_resource is PackedScene:
-		var packed_scene: PackedScene = scene_resource as PackedScene
-		_minigame_scene_cache[scene_index] = packed_scene
-		return packed_scene
-	return null
+	if scene_path.is_empty() or not ResourceLoader.exists(scene_path):
+		return ""
+	return scene_path
 
 
 func _count_completed_minigames(lesson_number: int) -> int:
@@ -1073,7 +1069,8 @@ func add_gardens() -> void:
 	for layout_index: int in range(gardens_layout.gardens.size()):
 		Log.trace("Gardens: Preparing garden %s with layout index %s" % [str(garden_index), str(layout_index)])
 		var garden_layout: GardenLayout = gardens_layout.gardens[layout_index]
-		var garden: Garden = GARDEN_SCENES[layout_index].instantiate()
+		var garden_scene: PackedScene = load(GARDEN_SCENE_PATHS[layout_index]) as PackedScene
+		var garden: Garden = garden_scene.instantiate()
 		garden_parent.add_child(garden)
 		garden.garden_index = garden_index
 		garden_index += 1
@@ -1422,7 +1419,7 @@ func _on_lesson_button_pressed() -> void:
 		current_garden_index = current_garden.garden_index,
 		look_and_learn_completed = false
 	}
-	get_tree().change_scene_to_packed(LOOK_AND_LEARN_SCENE)
+	SceneLoader.change_scene(LOOK_AND_LEARN_SCENE_PATH)
 
 
 func _on_boss_button_pressed(lesson_number: int, garden_index: int) -> void:
@@ -1438,7 +1435,7 @@ func _on_boss_button_pressed(lesson_number: int, garden_index: int) -> void:
 		skip_minigame_layout = true,
 		boss_gate_lesson = lesson_number
 	}
-	get_tree().change_scene_to_file(BOSS_MINIGAME_SCENE_PATH)
+	SceneLoader.change_scene(BOSS_MINIGAME_SCENE_PATH)
 
 
 func _on_final_boss_button_pressed(lesson_number: int, garden_index: int) -> void:
@@ -1455,14 +1452,14 @@ func _on_final_boss_button_pressed(lesson_number: int, garden_index: int) -> voi
 		boss_gate_lesson = lesson_number,
 		is_final_boss = true
 	}
-	get_tree().change_scene_to_file(BOSS_MINIGAME_SCENE_PATH)
+	SceneLoader.change_scene(BOSS_MINIGAME_SCENE_PATH)
 
 
 func _on_minigame_button_pressed(scene_index: int, minigame_number: int) -> void:
 	if is_locked:
 		return
-	var minigame_scene: PackedScene = _get_minigame_scene(scene_index)
-	if not minigame_scene:
+	var scene_path: String = _get_minigame_scene_path(scene_index)
+	if scene_path.is_empty():
 		Log.error("Gardens: Missing minigame scene for index %d" % scene_index)
 		return
 	# Block a second wedge click during the curtain-close await below.
@@ -1476,7 +1473,7 @@ func _on_minigame_button_pressed(scene_index: int, minigame_number: int) -> void
 		minigame_number = minigame_number,
 		minigame_completed = false
 	}
-	get_tree().change_scene_to_packed(minigame_scene)
+	SceneLoader.change_scene(scene_path)
 
 
 func _on_scroll_container_gui_input(event: InputEvent) -> void:
@@ -1515,7 +1512,7 @@ func _scroll_by_garden(p_direction: int) -> void:
 func _confirm_back_button_pressed() -> void:
 	UserDataManager.logout_student()
 	await (OpeningCurtain as OpeningCurtainClass).close()
-	get_tree().change_scene_to_file("res://sources/menus/login/login.tscn")
+	SceneLoader.change_scene("res://sources/menus/login/login.tscn")
 
 
 func _on_back_button_button_down() -> void:

sources/look_and_learn/look_and_learn.gd

@@ -160,7 +160,7 @@ func _back_to_gardens() -> void:
 	Log.info("LookAndLearn: Returning to gardens for lesson %d" % lesson_nb)
 	await (OpeningCurtain as OpeningCurtainClass).close()
 	Gardens.transition_data = gardens_data
-	get_tree().change_scene_to_file("res://sources/gardens/gardens.tscn")
+	SceneLoader.change_scene("res://sources/gardens/gardens.tscn")
 
 
 func _on_back_button_pressed() -> void:

sources/menus/language_selection/language_check.gd

@@ -15,6 +15,12 @@ var teacher_settings: TeacherSettings
 
 func _ready() -> void:
 	await get_tree().process_frame
+	if (ServerManager as ServerManagerClass).is_local_web_mode():
+		UserDataManager.ensure_joy_local_profile()
+		UserDataManager.set_language("fr_FR", true)
+		UserDataManager.save_all()
+		go_to_package_download()
+		return
 	device_language = UserDataManager.get_device_settings().language
 	Log.trace("LanguageCheck: Starting with device language %s" % device_language)
 	# Check the teacher settings, if we are logged in (this scene should not be accessible otherwise)

sources/menus/language_selection/package_downloader.gd

@@ -15,6 +15,9 @@ const MAIN_MENU_SCENE_PATH: String = "res://sources/menus/main/main_menu.tscn"
 const DEVICE_SELECTION_SCENE_PATH: String = "res://sources/menus/device_selection/device_selection.tscn"
 const LOGIN_SCENE_PATH: String = "res://sources/menus/login/login.tscn"
 const USER_LANGUAGE_RESOURCES_PATH: String = "user://language_resources"
+const LOCAL_WEB_PACK_PATH: String = "/content/fr_FR.zip"
+const LOCAL_WEB_PACK_VERSION: Dictionary = {"year": 2026, "month": 6, "day": 15}
+const GARDENS_SCENE_PATH: String = "res://sources/gardens/gardens.tscn"
 # Translation key shown in the error popup for each DownloadError value
 const ERROR_MESSAGES: Array[String] = [
 	"DISCONNECTED_ERROR",
@@ -63,6 +66,12 @@ func _ready() -> void:
 		Log.trace("PackageDownloader: Using language from teacherSettings: %s" % language)
 	current_language_path = USER_LANGUAGE_RESOURCES_PATH.path_join(language)
 	current_language_version = UserDataManager.get_device_settings().language_versions.get(language, {})
+
+	if (ServerManager as ServerManagerClass).is_local_web_mode():
+		server_language_version = LOCAL_WEB_PACK_VERSION
+		var origin: String = str(JavaScriptBridge.eval("window.location.origin"))
+		_start_pack_if_needed(origin + LOCAL_WEB_PACK_PATH)
+		return
 	
 	Log.trace("PackageDownloader: Checking internet access")
 	if not await ServerManager.check_internet_access():
@@ -97,6 +106,10 @@ func _ready() -> void:
 		_show_error(DownloadError.DOWNLOAD_FAILED)
 		return
 	
+	_start_pack_if_needed(res.body.url as String)
+
+
+func _start_pack_if_needed(pack_url: String) -> void:
 	# If the language pack is not already downloaded or an update is needed
 	if not DirAccess.dir_exists_absolute(current_language_path) or current_language_version != server_language_version:
 		Log.trace("PackageDownloader: A new version of the language pack has been detected.\n    Current version = " + str(current_language_version) + "\n    Server version = " + str(server_language_version))
@@ -116,8 +129,8 @@ func _ready() -> void:
 		# still run offline if the download fails; it is only removed during
 		# extraction, once the new pack has been fully downloaded.
 		http_request.set_download_file(USER_LANGUAGE_RESOURCES_PATH.path_join(language + ".zip"))
-		Log.trace("PackageDownloader: Downloading pack from %s" % res.body.url)
-		var request_error: Error = http_request.request(res.body.url as String)
+		Log.trace("PackageDownloader: Downloading pack from %s" % pack_url)
+		var request_error: Error = http_request.request(pack_url)
 		if request_error != OK:
 			Log.error("PackageDownloader: Cannot start language pack download: %s" % error_string(request_error))
 			_show_error(DownloadError.DOWNLOAD_FAILED)
@@ -255,6 +268,14 @@ func _go_to_next_scene() -> void:
 	
 	if not server_language_version.is_empty():
 		UserDataManager.set_language_version(language, server_language_version)
+
+	if (ServerManager as ServerManagerClass).is_local_web_mode():
+		if not UserDataManager.login_student("123"):
+			Log.error("PackageDownloader: Could not open Joy local profile")
+			_show_error(DownloadError.DISCONNECTED)
+			return
+		SceneLoader.change_scene(GARDENS_SCENE_PATH)
+		return
 	
 	# Check if we have a valid device id
 	if not UserDataManager.get_device_settings().device_id:

sources/menus/login/login.gd

@@ -2,7 +2,7 @@ extends Control
 
 const TEACHER_PASSWORD: String = "42"
 const BACK_SCENE_PATH: String = "res://sources/menus/main/main_menu.tscn"
-const NEXT_SCENE: PackedScene = preload("res://sources/gardens/gardens.tscn")
+const NEXT_SCENE_PATH: String = "res://sources/gardens/gardens.tscn"
 const TEACHER_SCENE_PATH: String = "res://sources/menus/settings/teacher_settings.tscn"
 const DEVELOPER_SCENE_PATH: String = "res://sources/menus/settings/developer_settings.tscn"
 const PACKAGE_LOADER_SCENE_PATH: String = "res://sources/menus/language_selection/package_downloader.tscn"
@@ -73,8 +73,7 @@ func _on_code_keyboard_password_entered(password: String) -> void:
 		await kalulu.play_kalulu_speech(right_password_speech)
 		await OpeningCurtain.close()
 		Log.trace("LoginScreen: Start loading next scene")
-		get_tree().change_scene_to_packed(NEXT_SCENE)
-		Log.trace("LoginScreen: End loading next scene")
+		SceneLoader.change_scene(NEXT_SCENE_PATH)
 	else:
 		Log.warn("LoginScreen: Unknown student code entered (length=%d)" % password.length())
 		kalulu_button.hide()

sources/menus/main/main_menu.gd

@@ -22,6 +22,7 @@ var dev_last_click_time: float = 0.0
 
 
 func _ready() -> void:
+	UserDataManager.ensure_joy_local_profile()
 	Log.info("MainMenu: Loaded successfuly")
 	version_label.text = Utils.get_application_version_with_code()
 	teacher_label.text = UserDataManager.get_device_settings().teacher
@@ -33,6 +34,9 @@ func _ready() -> void:
 func _on_main_button_pressed() -> void:
 	Log.info("MainMenu: Main button pressed")
 	play_button.set_disabled(true)
+	if (ServerManager as ServerManagerClass).is_local_web_mode():
+		_on_login_in()
+		return
 	if UserDataManager.get_device_settings().teacher:
 		Log.info("MainMenu: Device settings has teacher info, so start auto login-in")
 		_on_login_in()

sources/minigames/base/base_minigame.gd

@@ -435,7 +435,7 @@ func _go_back_to_the_garden() -> void:
 	_save_logs()
 	
 	Gardens.transition_data = gardens_data
-	get_tree().change_scene_to_file("res://sources/gardens/gardens.tscn")
+	SceneLoader.change_scene("res://sources/gardens/gardens.tscn")
 
 
 func _play_stimulus() -> void:

sources/minigames/frog/lilypad_track.gd

@@ -5,8 +5,7 @@ signal lilypad_in_center(lilypad: Lilypad)
 
 const LILYPAD_SCENE_PATH: String = "res://sources/minigames/frog/lilypad.tscn"
 
-static var _lilypad_scene: PackedScene
-
+var _lilypad_scene: PackedScene
 var top_to_bottom: bool = false
 var is_stopped: bool = false
 var is_cleared: bool = false

sources/utils/autoloads/database.gd

@@ -38,14 +38,20 @@ var words_path: String = get_language_folder() + "/words/"
 var additional_word_list: Dictionary = {}
 var is_open: bool = false
 
-@onready var db: SQLite = SQLite.new()
+@onready var db: Object = (
+	ClassDB.instantiate(&"SQLite") if ClassDB.class_exists(&"SQLite") else null
+)
 
 
 func _exit_tree() -> void:
-	db.close_db()
+	if db:
+		db.close_db()
 
 
 func connect_to_db() -> void:
+	if not db:
+		Log.error("Database: SQLite extension is not available")
+		return
 	if is_open:
 		Log.trace("Database: Opening database while a connection is already opened. Closing the previous one.")
 		db.close_db()

sources/utils/autoloads/scene_loader.gd

@@ -0,0 +1,70 @@
+extends Node
+## Scene changer that keeps peak memory low on low-end devices.
+##
+## [method SceneTree.change_scene_to_file] loads the new scene while the old
+## one is still fully resident, so transitions between heavy scenes (gardens,
+## minigames) momentarily need the memory of both — enough to OOM-crash old
+## tablets. This helper frees the current scene first, then streams the new
+## scene from disk on a background thread so the main thread keeps rendering
+## frames instead of freezing.
+##
+## Callers are expected to have covered the screen (OpeningCurtain closed)
+## before calling [method change_scene]; the curtain stays visible while the
+## tree has no current scene.
+
+## Scene shown if the requested scene fails to load, so the player is never
+## stuck on a black screen.
+const FALLBACK_SCENE_PATH: String = "res://sources/menus/main/main_menu.tscn"
+
+var _is_changing: bool = false
+
+
+func change_scene(scene_path: String) -> void:
+	if _is_changing:
+		Log.warn("SceneLoader: Change to %s requested while another change is in progress; ignoring" % scene_path)
+		return
+	if not ResourceLoader.exists(scene_path):
+		Log.error("SceneLoader: Scene does not exist: %s" % scene_path)
+		return
+	_is_changing = true
+	# Defer so the calling scene is never freed while one of its methods is
+	# still on the stack.
+	_change_scene_deferred.call_deferred(scene_path)
+
+
+func _change_scene_deferred(scene_path: String) -> void:
+	var tree: SceneTree = get_tree()
+	# Free the old scene before loading the new one: this roughly halves the
+	# memory peak of the transition.
+	if tree.current_scene:
+		tree.unload_current_scene()
+	var error: Error = ResourceLoader.load_threaded_request(scene_path)
+	if error != OK:
+		Log.error("SceneLoader: Could not start loading %s (error %s)" % [scene_path, error_string(error)])
+		_finish_with_fallback(tree, scene_path)
+		return
+	var status: ResourceLoader.ThreadLoadStatus = ResourceLoader.load_threaded_get_status(scene_path)
+	while status == ResourceLoader.THREAD_LOAD_IN_PROGRESS:
+		await tree.process_frame
+		status = ResourceLoader.load_threaded_get_status(scene_path)
+	if status != ResourceLoader.THREAD_LOAD_LOADED:
+		Log.error("SceneLoader: Failed to load %s (status %d)" % [scene_path, status])
+		_finish_with_fallback(tree, scene_path)
+		return
+	var packed_scene: PackedScene = ResourceLoader.load_threaded_get(scene_path) as PackedScene
+	if not packed_scene:
+		Log.error("SceneLoader: %s is not a PackedScene" % scene_path)
+		_finish_with_fallback(tree, scene_path)
+		return
+	error = tree.change_scene_to_packed(packed_scene)
+	if error != OK:
+		Log.error("SceneLoader: Could not change to %s (error %s)" % [scene_path, error_string(error)])
+		_finish_with_fallback(tree, scene_path)
+		return
+	_is_changing = false
+
+
+func _finish_with_fallback(tree: SceneTree, failed_scene_path: String) -> void:
+	_is_changing = false
+	if failed_scene_path != FALLBACK_SCENE_PATH:
+		tree.change_scene_to_file(FALLBACK_SCENE_PATH)

sources/utils/autoloads/scene_loader.gd.uid

@@ -0,0 +1 @@
+uid://bm3xnmft2e4ul

sources/utils/autoloads/server_manager.gd

@@ -25,6 +25,10 @@ var environment_setting: int = 1
 @onready var loading_rect: TextureRect = $TextureRect
 
 
+func is_local_web_mode() -> bool:
+	return OS.has_feature("web") and bool(ProjectSettings.get_setting("application/custom/local_web_mode", false))
+
+
 func _ready() -> void:
 	var config: ConfigFile = ConfigFile.new()
 	var load_error: Error = config.load(CONFIG_PATH)
@@ -84,6 +88,8 @@ func _save_environment_config() -> void:
 
 
 func first_login_student() -> void:
+	if is_local_web_mode():
+		return
 	await _post_json_request("submit_student_session", {"student_id": UserDataManager.student})
 
 
@@ -185,6 +191,8 @@ func reset_language(language: String) -> Dictionary:
 #region Sender functions
 
 func check_internet_access() -> bool:
+	if is_local_web_mode():
+		return false
 	Log.trace("ServerManager: Sending simple request to " + INTERNET_CHECK_URL + " to check if internet is available")
 	var res: Error = internet_check.request(INTERNET_CHECK_URL)
 	if res == OK:

sources/utils/autoloads/user_data_manager.gd

@@ -107,6 +107,8 @@ func _process(_delta: float) -> void:
 #region synchronization
 
 func start_synchronization_timer() -> void:
+	if (ServerManager as ServerManagerClass).is_local_web_mode():
+		return
 	if not synchronization_timer_running:
 		synchronization_timer = 0
 		synchronization_timer_running = true
@@ -117,6 +119,52 @@ func stop_synchronization_timer() -> void:
 	synchronization_timer_running = false
 	Log.trace("UserDataManager: Synchronization timer stopped")
 
+
+func ensure_joy_local_profile() -> void:
+	if not (ServerManager as ServerManagerClass).is_local_web_mode():
+		return
+
+	var settings: DeviceSettings = get_device_settings()
+	settings.language = "fr_FR"
+	settings.teacher = "profil-local"
+	settings.device_id = 1
+	_save_device_settings()
+
+	var teacher_path: String = get_teacher_settings_path()
+	if FileAccess.file_exists(teacher_path):
+		_load_teacher_settings()
+	if not teacher_settings:
+		teacher_settings = TeacherSettings.new()
+		teacher_settings.account_type = TeacherSettings.AccountType.PARENT
+		teacher_settings.education_method = TeacherSettings.EducationMethod.APP_ONLY
+		teacher_settings.email = "profil-local"
+		teacher_settings.token = "local-only"
+		teacher_settings.language = "fr_FR"
+		teacher_settings.server_language_validated = true
+		var joy: StudentData = StudentData.new()
+		joy.code = 123
+		joy.name = "Joy"
+		joy.age = 5
+		joy.level = StudentData.Level.BEGINNER
+		var joy_students: Array[StudentData] = [joy]
+		teacher_settings.students[1] = joy_students
+		DirAccess.make_dir_recursive_absolute(get_teacher_folder())
+		save_teacher_settings()
+	else:
+		teacher_settings.language = "fr_FR"
+		teacher_settings.server_language_validated = true
+		if not teacher_settings.students.has(1) or (teacher_settings.students[1] as Array).is_empty():
+			var joy: StudentData = StudentData.new()
+			joy.code = 123
+			joy.name = "Joy"
+			joy.age = 5
+			joy.level = StudentData.Level.BEGINNER
+			var joy_students: Array[StudentData] = [joy]
+			teacher_settings.students[1] = joy_students
+		save_teacher_settings()
+
+	TranslationServer.set_locale("fr_FR")
+
 #endregion
 
 #region Registering and logging in

tests/unit_tests/test_utils.gd.uid

@@ -0,0 +1 @@
+uid://34wj4ytlkuvn