diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..66e85b0
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,123 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    strategy:
+      fail-fast: false
+      matrix:
+        check: [lint, typecheck]
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v5
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run ${{ matrix.check }}
+        run: pnpm ${{ matrix.check }}
+
+  build:
+    needs: check
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows-latest
+            platform: windows
+            build-script: build:win
+          - os: macos-latest
+            platform: macos
+            build-script: build:mac
+          - os: ubuntu-latest
+            platform: linux
+            build-script: build:linux
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v5
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Set artifact version
+        id: version
+        shell: bash
+        run: |
+          if [[ "${GITHUB_REF}" == refs/tags/* ]]; then
+            echo "value=${GITHUB_REF_NAME}" >> "$GITHUB_OUTPUT"
+          else
+            echo "value=${GITHUB_SHA::7}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Build
+        env:
+          BUILD_VERSION: ${{ steps.version.outputs.value }}
+          CSC_IDENTITY_AUTO_DISCOVERY: false
+        run: pnpm ${{ matrix.build-script }}
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v6
+        with:
+          name: ${{ matrix.platform }}-${{ steps.version.outputs.value }}
+          path: |
+            dist/*.exe
+            dist/*.dmg
+            dist/*.AppImage
+          if-no-files-found: error
+
+  release:
+    needs: build
+    if: startsWith(github.ref, 'refs/tags/v')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v6
+        with:
+          path: dist
+          merge-multiple: true
+
+      - name: Create release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            dist/*.exe
+            dist/*.dmg
+            dist/*.AppImage
+          generate_release_notes: true
diff --git a/package.json b/package.json
index 6dcdf23..7627044 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,10 @@
     "format:fix": "prettier --write .",
     "package": "pnpm run build && electron-builder --dir",
     "package:run": "pnpm run package && open dist/mac*/'VRC Circle.app'",
-    "dist": "pnpm run build && electron-builder"
+    "dist": "pnpm run build && electron-builder",
+    "build:win": "pnpm run build && electron-builder --win",
+    "build:mac": "pnpm run build && electron-builder --mac",
+    "build:linux": "pnpm run build && electron-builder --linux"
   },
   "dependencies": {
     "electron-updater": "^6.3.9",
diff --git a/src/renderer/src/features/avatar/AvatarsView.tsx b/src/renderer/src/features/avatar/AvatarsView.tsx
index 9d18a83..446fb54 100644
--- a/src/renderer/src/features/avatar/AvatarsView.tsx
+++ b/src/renderer/src/features/avatar/AvatarsView.tsx
@@ -395,7 +395,8 @@ function FavoritesTab({ filter, searching }: { filter: AvatarFilter; searching:
   const toggle = (id: string) =>
     setSelected((s) => {
       const next = new Set(s);
-      next.has(id) ? next.delete(id) : next.add(id);
+      if (next.has(id)) next.delete(id);
+      else next.add(id);
       return next;
     });
 
@@ -429,7 +430,10 @@ function FavoritesTab({ filter, searching }: { filter: AvatarFilter; searching:
     setSelected((s) => {
       const next = new Set(s);
       const all = ids.every((id) => next.has(id));
-      for (const id of ids) all ? next.delete(id) : next.add(id);
+      for (const id of ids) {
+        if (all) next.delete(id);
+        else next.add(id);
+      }
       return next;
     });
 
diff --git a/src/renderer/src/features/friends/FriendsSidebar.tsx b/src/renderer/src/features/friends/FriendsSidebar.tsx
index d7d8860..af7164f 100644
--- a/src/renderer/src/features/friends/FriendsSidebar.tsx
+++ b/src/renderer/src/features/friends/FriendsSidebar.tsx
@@ -30,7 +30,8 @@ export function FriendsSidebar({ onOpen }: { onOpen: (id: string) => void }) {
   const toggle = (id: string) =>
     setCollapsed((prev) => {
       const next = new Set(prev);
-      next.has(id) ? next.delete(id) : next.add(id);
+      if (next.has(id)) next.delete(id);
+      else next.add(id);
       return next;
     });
 
diff --git a/src/renderer/src/features/world/MyFavoriteWorldsSection.tsx b/src/renderer/src/features/world/MyFavoriteWorldsSection.tsx
index fd8f284..19776f9 100644
--- a/src/renderer/src/features/world/MyFavoriteWorldsSection.tsx
+++ b/src/renderer/src/features/world/MyFavoriteWorldsSection.tsx
@@ -102,7 +102,10 @@ export function MyFavoriteWorldsSection({ filter }: { filter?: WorldFilter }) {
     setSelected((s) => {
       const next = new Set(s);
       const all = ids.every((id) => next.has(id));
-      for (const id of ids) all ? next.delete(id) : next.add(id);
+      for (const id of ids) {
+        if (all) next.delete(id);
+        else next.add(id);
+      }
       return next;
     });