Fix Android build: ensure targets installed on stable toolchain

.gitea/workflows/build.yml

@@ -124,13 +124,14 @@ jobs:
           toolchain: stable
           profile: minimal
           override: true
+          target: aarch64-linux-android
       
       - name: Add Android targets
         run: |
-          rustup target add aarch64-linux-android
-          rustup target add armv7-linux-androideabi
-          rustup target add x86_64-linux-android
-          rustup target add i686-linux-android
+          rustup target add aarch64-linux-android --toolchain stable
+          rustup target add armv7-linux-androideabi --toolchain stable
+          rustup target add x86_64-linux-android --toolchain stable
+          rustup target add i686-linux-android --toolchain stable
       
       - name: Install dependencies (root)
         run: npm install
@@ -143,7 +144,10 @@ jobs:
         run: npm run tauri android init
       
       - name: Build Android APK
-        run: npm run tauri android build
+        shell: cmd
+        run: |
+          set RUSTUP_TOOLCHAIN=stable
+          npm run tauri android build
         env:
           ANDROID_HOME: ${{ env.ANDROID_HOME }}
           NDK_HOME: ${{ env.ANDROID_HOME }}/ndk/25.2.9519653