diff --git a/.gitea/workflows/build-app-preview.yml b/.gitea/workflows/build-app-preview.yml
new file mode 100644
index 0000000..c519204
--- /dev/null
+++ b/.gitea/workflows/build-app-preview.yml
@@ -0,0 +1,323 @@
+name: Build App (Preview)
+
+# Builds the Tauri app for branches other than main and exposes the bundles as
+# workflow artifacts. No Gitea release, no GitHub sync — intended for local
+# smoke-testing of feature branches before they merge.
+
+on:
+  push:
+    branches-ignore: [main]
+    paths:
+      - "app/**"
+      - "VERSION"
+      - ".gitea/workflows/build-app-preview.yml"
+  workflow_dispatch:
+
+jobs:
+  compute-version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.VERSION }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Compute preview version
+        id: version
+        run: |
+          MAJOR_MINOR=$(cat VERSION | tr -d '[:space:]')
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          VERSION="${MAJOR_MINOR}.0-preview.${SHORT_SHA}"
+          echo "VERSION=${VERSION}" >> $GITHUB_OUTPUT
+          echo "Computed preview version: ${VERSION}"
+
+  build-linux:
+    runs-on: ubuntu-latest
+    needs: [compute-version]
+    steps:
+      - name: Install Node.js 22
+        run: |
+          NEED_INSTALL=false
+          if command -v node >/dev/null 2>&1; then
+            NODE_MAJOR=$(node --version | sed 's/v\([0-9]*\).*/\1/')
+            OLD_NODE_DIR=$(dirname "$(which node)")
+            echo "Found Node.js $(node --version) at $(which node) (major: ${NODE_MAJOR})"
+            if [ "$NODE_MAJOR" -lt 22 ]; then
+              echo "Node.js ${NODE_MAJOR} is too old, removing before installing 22..."
+              sudo rm -f "${OLD_NODE_DIR}/node" "${OLD_NODE_DIR}/npm" "${OLD_NODE_DIR}/npx" "${OLD_NODE_DIR}/corepack"
+              hash -r
+              NEED_INSTALL=true
+            fi
+          else
+            echo "Node.js not found, installing 22..."
+            NEED_INSTALL=true
+          fi
+          if [ "$NEED_INSTALL" = true ]; then
+            curl -fsSL https://deb.nodesource.com/setup_22.x | sudo -E bash -
+            sudo apt-get install -y nodejs
+            hash -r
+          fi
+          node --version
+          npm --version
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set app version
+        run: |
+          # Tauri / Cargo require a strict semver; strip the preview suffix for
+          # the bundle version but keep it in the artifact filename.
+          BASE_VERSION="$(echo '${{ needs.compute-version.outputs.version }}' | cut -d'-' -f1)"
+          sed -i "s/\"version\": \".*\"/\"version\": \"${BASE_VERSION}\"/" app/src-tauri/tauri.conf.json
+          sed -i "s/\"version\": \".*\"/\"version\": \"${BASE_VERSION}\"/" app/package.json
+          sed -i "s/^version = \".*\"/version = \"${BASE_VERSION}\"/" app/src-tauri/Cargo.toml
+          echo "Patched version to ${BASE_VERSION}"
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libgtk-3-dev \
+            libwebkit2gtk-4.1-dev \
+            libayatana-appindicator3-dev \
+            librsvg2-dev \
+            libsoup-3.0-dev \
+            libssl-dev \
+            libxdo-dev \
+            patchelf \
+            pkg-config \
+            build-essential \
+            curl \
+            wget \
+            file \
+            xdg-utils
+
+      - name: Install Rust stable
+        run: |
+          if command -v rustup >/dev/null 2>&1; then
+            rustup update stable
+            rustup default stable
+          else
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
+          fi
+          export PATH="$HOME/.cargo/bin:$PATH"
+          rustc --version
+          cargo --version
+
+      - name: Install frontend dependencies
+        working-directory: ./app
+        run: |
+          rm -rf node_modules package-lock.json
+          npm install
+
+      - name: Install Tauri CLI
+        working-directory: ./app
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          npx tauri --version || npm install @tauri-apps/cli
+
+      - name: Build Tauri app
+        working-directory: ./app
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          npx tauri build
+
+      - name: Collect artifacts
+        run: |
+          mkdir -p artifacts
+          cp app/src-tauri/target/release/bundle/appimage/*.AppImage artifacts/ 2>/dev/null || true
+          cp app/src-tauri/target/release/bundle/deb/*.deb artifacts/ 2>/dev/null || true
+          cp app/src-tauri/target/release/bundle/rpm/*.rpm artifacts/ 2>/dev/null || true
+          ls -la artifacts/
+
+      - name: Upload Linux artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: triple-c-${{ needs.compute-version.outputs.version }}-linux
+          path: artifacts/
+          if-no-files-found: error
+          retention-days: 14
+
+  build-macos:
+    runs-on: macos-latest
+    needs: [compute-version]
+    steps:
+      - name: Install Node.js 22
+        run: |
+          NEED_INSTALL=false
+          if command -v node >/dev/null 2>&1; then
+            NODE_MAJOR=$(node --version | sed 's/v\([0-9]*\).*/\1/')
+            if [ "$NODE_MAJOR" -lt 22 ]; then
+              NEED_INSTALL=true
+            fi
+          else
+            NEED_INSTALL=true
+          fi
+          if [ "$NEED_INSTALL" = true ]; then
+            brew install node@22
+            brew link --overwrite node@22
+          fi
+          node --version
+          npm --version
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set app version
+        run: |
+          BASE_VERSION="$(echo '${{ needs.compute-version.outputs.version }}' | cut -d'-' -f1)"
+          sed -i '' "s/\"version\": \".*\"/\"version\": \"${BASE_VERSION}\"/" app/src-tauri/tauri.conf.json
+          sed -i '' "s/\"version\": \".*\"/\"version\": \"${BASE_VERSION}\"/" app/package.json
+          sed -i '' "s/^version = \".*\"/version = \"${BASE_VERSION}\"/" app/src-tauri/Cargo.toml
+          echo "Patched version to ${BASE_VERSION}"
+
+      - name: Install Rust stable
+        run: |
+          if command -v rustup >/dev/null 2>&1; then
+            rustup update stable
+            rustup default stable
+          else
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
+          fi
+          export PATH="$HOME/.cargo/bin:$PATH"
+          rustup target add aarch64-apple-darwin x86_64-apple-darwin
+          rustc --version
+          cargo --version
+
+      - name: Install frontend dependencies
+        working-directory: ./app
+        run: |
+          rm -rf node_modules
+          npm install
+
+      - name: Install Tauri CLI
+        working-directory: ./app
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          npx tauri --version || npm install @tauri-apps/cli
+
+      - name: Build Tauri app (universal)
+        working-directory: ./app
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          npx tauri build --target universal-apple-darwin
+
+      - name: Collect artifacts
+        run: |
+          mkdir -p artifacts
+          cp app/src-tauri/target/universal-apple-darwin/release/bundle/dmg/*.dmg artifacts/ 2>/dev/null || true
+          cp app/src-tauri/target/universal-apple-darwin/release/bundle/macos/*.app.tar.gz artifacts/ 2>/dev/null || true
+          ls -la artifacts/
+
+      - name: Upload macOS artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: triple-c-${{ needs.compute-version.outputs.version }}-macos
+          path: artifacts/
+          if-no-files-found: error
+          retention-days: 14
+
+  build-windows:
+    runs-on: windows-latest
+    needs: [compute-version]
+    defaults:
+      run:
+        shell: cmd
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set app version
+        shell: powershell
+        run: |
+          $raw = "${{ needs.compute-version.outputs.version }}"
+          $version = $raw.Split('-')[0]
+          (Get-Content app/src-tauri/tauri.conf.json) -replace '"version": ".*?"', "`"version`": `"$version`"" | Set-Content app/src-tauri/tauri.conf.json
+          (Get-Content app/package.json) -replace '"version": ".*?"', "`"version`": `"$version`"" | Set-Content app/package.json
+          (Get-Content app/src-tauri/Cargo.toml) -replace '^version = ".*?"', "version = `"$version`"" | Set-Content app/src-tauri/Cargo.toml
+          Write-Host "Patched version to $version"
+
+      - name: Install Rust stable
+        run: |
+          where rustup >nul 2>&1 && (
+            rustup update stable
+            rustup default stable
+          ) || (
+            curl -fSL -o rustup-init.exe https://win.rustup.rs/x86_64
+            rustup-init.exe -y --default-toolchain stable
+            del rustup-init.exe
+          )
+
+      - name: Install Node.js
+        run: |
+          where node >nul 2>&1 && (
+            node --version
+          ) || (
+            curl -fSL -o node-install.msi "https://nodejs.org/dist/v22.14.0/node-v22.14.0-x64.msi"
+            msiexec /i node-install.msi /quiet /norestart
+            del node-install.msi
+          )
+
+      - name: Verify tools
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          rustc --version
+          cargo --version
+          node --version
+          npm --version
+
+      - name: Install Tauri CLI via cargo
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          cargo install tauri-cli --version "^2"
+
+      - name: Fix npm platform detection
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          npm config set os win32
+          npm config list
+
+      - name: Install frontend dependencies
+        working-directory: ./app
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          if exist node_modules rmdir /s /q node_modules
+          npm ci
+
+      - name: Build frontend
+        working-directory: ./app
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          npm run build
+
+      - name: Build Tauri app
+        working-directory: ./app
+        env:
+          TAURI_CONFIG: "{\"build\":{\"beforeBuildCommand\":\"\"}}"
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          cargo tauri build
+
+      - name: Collect artifacts
+        run: |
+          set "PATH=%USERPROFILE%\.cargo\bin;C:\Program Files\nodejs;%PATH%"
+          mkdir artifacts
+          copy app\src-tauri\target\release\bundle\msi\*.msi artifacts\ 2>nul
+          copy app\src-tauri\target\release\bundle\nsis\*.exe artifacts\ 2>nul
+          dir artifacts\
+
+      - name: Upload Windows artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: triple-c-${{ needs.compute-version.outputs.version }}-windows
+          path: artifacts/
+          if-no-files-found: error
+          retention-days: 14