Merge branch 'wip-docker-build'

Aggiunge pipeline Docker per build APK Android:
- Dockerfile con Java 21, Android SDK 34, ImageMagick per icone
- build.sh con flag --head per build da ultimo commit
- Icone generate da assets/icon-only.png via ImageMagick
- Fix kotlin-stdlib conflict e versione da package.json

docker/Dockerfile

@@ -0,0 +1,86 @@
+# ── Android SDK + Node (ambiente di build) ────────────────────────────────────
+# eclipse-temurin:21 (Adoptium) su Ubuntu Jammy include Java 21
+FROM eclipse-temurin:21-jdk-jammy
+
+# Installa Node.js 20 e dipendenze di sistema
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    wget \
+    unzip \
+    imagemagick \
+    && curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Android SDK ─────────────────────────────────────────────────────────────────
+ENV ANDROID_HOME=/opt/android-sdk
+ENV PATH=$PATH:$ANDROID_HOME/cmdline-tools/latest/bin:$ANDROID_HOME/platform-tools
+
+RUN mkdir -p $ANDROID_HOME/cmdline-tools && \
+    wget -q https://dl.google.com/android/repository/commandlinetools-linux-11076708_latest.zip \
+         -O /tmp/cmdline-tools.zip && \
+    unzip -q /tmp/cmdline-tools.zip -d /tmp && \
+    mv /tmp/cmdline-tools $ANDROID_HOME/cmdline-tools/latest && \
+    rm /tmp/cmdline-tools.zip
+
+RUN yes | sdkmanager --licenses > /dev/null && \
+    sdkmanager \
+        "platform-tools" \
+        "platforms;android-34" \
+        "build-tools;34.0.0"
+
+# ── Progetto (solo dipendenze npm, senza sorgenti) ────────────────────────────
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+# ── Capacitor config ──────────────────────────────────────────────────────────
+RUN cat > capacitor.config.json <<'EOF'
+{
+  "appId": "com.davide.biteplan",
+  "appName": "BitePlan",
+  "webDir": "dist",
+  "server": {
+    "androidScheme": "https"
+  }
+}
+EOF
+
+# ── Installa Capacitor e prepara la piattaforma Android ───────────────────────
+RUN npm install @capacitor/core @capacitor/cli @capacitor/android --save
+
+RUN npx cap add android
+
+# ── Versione da package.json → android/app/build.gradle ──────────────────────
+RUN node -e "\
+      const v = require('./package.json').version; \
+      const [a,b,c] = v.split('.').map(Number); \
+      const vc = a*10000 + b*100 + c; \
+      const fs = require('fs'); \
+      let g = fs.readFileSync('android/app/build.gradle','utf8'); \
+      g = g.replace(/versionCode \d+/, 'versionCode '+vc); \
+      g = g.replace(/versionName \"[^\"]*\"/, 'versionName \"'+v+'\"'); \
+      fs.writeFileSync('android/app/build.gradle', g); \
+    "
+
+# ── Icone Android da assets/icon-only.png (via ImageMagick) ─────────────────
+COPY assets/ ./assets/
+RUN rm -rf android/app/src/main/res/mipmap-anydpi-v26 && \
+    for d in mdpi:48 hdpi:72 xhdpi:96 xxhdpi:144 xxxhdpi:192; do \
+      dest=android/app/src/main/res/mipmap-${d%:*}; \
+      convert assets/icon-only.png -resize ${d#*:}x${d#*:} $dest/ic_launcher.png; \
+      cp $dest/ic_launcher.png $dest/ic_launcher_round.png; \
+    done
+
+# Fix kotlin-stdlib duplicate class conflict (stdlib 1.8+ already includes jdk7/jdk8)
+RUN printf '\nsubprojects {\n    configurations.all {\n        resolutionStrategy {\n            force "org.jetbrains.kotlin:kotlin-stdlib:1.8.22"\n            force "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.22"\n            force "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.22"\n        }\n    }\n}\n' >> android/build.gradle
+
+# ── Runtime: dist/ viene montato come volume dall'host ────────────────────────
+# build.sh esegue: docker run -v ./dist:/app/dist ...
+# Qui cap sync copia dist/ in android/assets, poi Gradle builda l'APK
+
+CMD npx cap sync android && \
+    cd android && chmod +x gradlew && ./gradlew assembleDebug --no-daemon && \
+    cp app/build/outputs/apk/debug/app-debug.apk /app/dist/biteplan.apk && \
+    echo "APK generato: /app/dist/biteplan.apk"

docker/README.md

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+# Build APK — Docker
+
+Genera un APK Android debug senza installare nulla sull'host oltre a Docker.
+
+## Requisiti host
+
+| Requisito | Dettaglio |
+|-----------|-----------|
+| **Architettura** | x86_64 (amd64) — ARM/aarch64 non supportato |
+| **OS** | Linux x86_64 o macOS x86_64 |
+| **Docker** | Installato e avviato |
+| **Node.js** | v18+ (per il build Vite locale) |
+
+> Gli Android build-tools (`aapt2`, `zipalign`, ecc.) sono binari nativi x86_64 e non girano su host ARM senza emulazione QEMU.
+
+## Utilizzo
+
+Dalla root del progetto:
+
+```bash
+# Build dalla working directory (file attuali)
+bash docker/build.sh
+
+# Build da HEAD (ignora modifiche non committate)
+bash docker/build.sh --head
+```
+
+L'APK viene generato in `output/biteplan.apk`.
+
+## Prima build
+
+La prima esecuzione scarica Android SDK (~1 GB) e può richiedere **10-15 minuti**.
+Le build successive usano la cache Docker e sono molto più rapide.
+
+## Installazione su dispositivo
+
+Con ADB:
+
+```bash
+adb install output/biteplan.apk
+```
+
+## Pipeline
+
+```
+[host] npm run build      → dist/   (montato come volume in sola lettura)
+[docker] cap sync         → copia dist/ in android/assets/
+[docker] gradlew assembleDebug
+[host]  output/biteplan.apk
+```
+
+## Note
+
+- APK di tipo **debug**, non firmato per la produzione
+- App ID: `com.davide.biteplan`
+- Android target: API 34

docker/build.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+DIST_DIR="$PROJECT_ROOT/dist"
+
+FROM_HEAD=false
+for arg in "$@"; do
+  [[ "$arg" == "--head" ]] && FROM_HEAD=true
+done
+
+# ── Build Vite ────────────────────────────────────────────────────────────────
+if $FROM_HEAD; then
+  COMMIT_SHA=$(git -C "$PROJECT_ROOT" rev-parse --short HEAD)
+  echo "==> Build Vite da HEAD ($COMMIT_SHA)..."
+  TMPDIR=$(mktemp -d)
+  trap 'rm -rf "$TMPDIR"' EXIT
+  git -C "$PROJECT_ROOT" archive HEAD | tar -x -C "$TMPDIR"
+  cd "$TMPDIR"
+  npm ci --silent
+  npm run build --silent
+  DIST_DIR="$TMPDIR/dist"
+  cd "$PROJECT_ROOT"
+else
+  echo "==> Build Vite dalla working directory..."
+  cd "$PROJECT_ROOT"
+  npm ci --silent
+  npm run build --silent
+fi
+
+# ── Build immagine Docker ─────────────────────────────────────────────────────
+echo "==> Build immagine Docker..."
+docker build \
+    -f "$SCRIPT_DIR/Dockerfile" \
+    -t biteplan-builder \
+    "$PROJECT_ROOT"
+
+# ── Generazione APK (dist/ montato come volume) ───────────────────────────────
+echo "==> Generazione APK..."
+docker run --rm \
+    -v "$DIST_DIR:/app/dist" \
+    biteplan-builder
+
+echo ""
+echo "APK pronto in: $DIST_DIR/biteplan.apk"