Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `.github/workflows/build.yml:134-135` </location>
<code_context>
+        shell: pwsh
+        run: |
+          # 优先使用 WebView2 Runtime，其次使用 Edge 安装目录
+          $wv2Base = "C:\Program Files (x86)\Microsoft\EdgeWebView\Application"
+          if (-not (Test-Path $wv2Base)) {
+            $wv2Base = "C:\Program Files (x86)\Microsoft\Edge\Application"
+          }
</code_context>

<issue_to_address>
**suggestion:** Consider also probing 64-bit installation paths to improve WebView2/Edge detection.

On some systems WebView2/Edge installs under `C:\Program Files\...` (64-bit) rather than `C:\Program Files (x86)\...`, so limiting detection to the x86 path can incorrectly report that no runtime is available. Consider checking both `Program Files (x86)` and `Program Files`, then selecting the newest version found across all paths before failing.
</issue_to_address>

Please address the comments from this code review:

## Overall Comments
- The workflow always runs the WebView2 fixed-runtime download for all Windows architectures, but the comment notes that arm64 packaging is not supported yet; consider guarding this step and the `fixed-webview` artifact upload with a condition (e.g. `if: matrix.arch == 'x86_64'`) to avoid failures or misleading artifacts for unsupported arches.
- The WebView2 fixed runtime version is currently hardcoded in the workflow; extracting it to a single env/matrix variable (and possibly reusing it in the artifact name or log output) would make future version bumps less error‑prone.

## Individual Comments

### Comment 1
<location> `.github/workflows/build.yml:134-136` </location>
<code_context>
+        run: |
+          $archMap = @{ 'x86_64' = 'x64'; 'aarch64' = 'arm64' }
+          $arch = $archMap['${{ matrix.arch }}']
+          $version = '133.0.3065.92'
+          $cabName = "Microsoft.WebView2.FixedVersionRuntime.$version.$arch.cab"
+          $uri = "https://github.com/westinyang/WebView2RuntimeArchive/releases/download/$version/$cabName"
+
+          Write-Host "Downloading $cabName ..."
</code_context>

<issue_to_address>
**🚨 issue (security):** Relying on a third-party GitHub mirror without integrity checks introduces supply-chain risk.

This downloads `westinyang/WebView2RuntimeArchive` artifacts without any integrity verification, so a compromise of that repo/release would inject a malicious WebView2 runtime into your CI artifacts. Please either fetch the runtime from an official Microsoft source or add a pinned checksum verification of the CAB before using it to mitigate this supply-chain risk.
</issue_to_address>

### Comment 2
<location> `.github/workflows/build.yml:129-135` </location>
<code_context>
+      - name: Download WebView2 Fixed Version Runtime
+        shell: pwsh
+        run: |
+          $archMap = @{ 'x86_64' = 'x64'; 'aarch64' = 'arm64' }
+          $arch = $archMap['${{ matrix.arch }}']
+          $version = '133.0.3065.92'
+          $cabName = "Microsoft.WebView2.FixedVersionRuntime.$version.$arch.cab"
</code_context>

<issue_to_address>
**suggestion:** Handle unknown architectures more defensively to avoid silent misconfiguration.

If `matrix.arch` ever changes (e.g. to `amd64`) or a new architecture is added, `$archMap[...]` will return `$null`, producing an invalid CAB name/URL and a confusing failure. Consider validating the key first and throwing a clear error when it’s missing:

```pwsh
$matrixArch = '${{ matrix.arch }}'
if (-not $archMap.ContainsKey($matrixArch)) {
  throw "Unsupported architecture: $matrixArch"
}
$arch = $archMap[$matrixArch]
```

```suggestion
      - name: Download WebView2 Fixed Version Runtime
        shell: pwsh
        run: |
          $archMap = @{ 'x86_64' = 'x64'; 'aarch64' = 'arm64' }
          $matrixArch = '${{ matrix.arch }}'
          if (-not $archMap.ContainsKey($matrixArch)) {
            throw "Unsupported architecture: $matrixArch"
          }
          $arch = $archMap[$matrixArch]
          $version = '133.0.3065.92'
          $cabName = "Microsoft.WebView2.FixedVersionRuntime.$version.$arch.cab"
```
</issue_to_address>

Please address the comments from this code review:

## Overall Comments
- In `main.rs`, you skip `webview2::ensure_webview2()` whenever `WEBVIEW2_BROWSER_EXECUTABLE_FOLDER` is set, but don’t verify that the path actually exists; consider checking that the directory is present/valid before skipping installation to avoid confusing failures when the env var is set incorrectly.
- The WebView2 runtime download step hardcodes the version and GUID map directly in the workflow; consider centralizing these as clearly named variables or a separate script so that updating the runtime version (and matching GUIDs) is less error‑prone in future.

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `src-tauri/src/main.rs:19-26` </location>
<code_context>
                 std::env::set_var("WEBVIEW2_USER_DATA_FOLDER", &webview_data_dir);
+
+                // 检测内置的 WebView2 固定版本运行时
+                let webview2_runtime_dir = exe_dir.join("webview2_runtime");
+                if webview2_runtime_dir.exists() {
+                    std::env::set_var(
+                        "WEBVIEW2_BROWSER_EXECUTABLE_FOLDER",
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Use a directory-specific check instead of exists() to avoid misconfiguration.

If `webview2_runtime` is a file or broken symlink, `exists()` still returns true and we’ll set `WEBVIEW2_BROWSER_EXECUTABLE_FOLDER` to an invalid path, causing harder-to-diagnose failures later. Using `webview2_runtime_dir.is_dir()` ensures the env var is only set when the path is actually a directory containing the runtime.

```suggestion
                // 检测内置的 WebView2 固定版本运行时
                let webview2_runtime_dir = exe_dir.join("webview2_runtime");
                if webview2_runtime_dir.is_dir() {
                    std::env::set_var(
                        "WEBVIEW2_BROWSER_EXECUTABLE_FOLDER",
                        &webview2_runtime_dir,
                    );
                }
```
</issue_to_address>