fix: skip resedit manifest embed on Windows arm64 builds (#556)

- afterPack leaves stock Electron PE on win-arm64-unpacked; resedit
  regenerate() can pass CI validation yet fail to materialize Mesh-client.exe
  during NSIS install on Windows 11 ARM.
- x64 builds still embed longPathAware via resedit; contract test asserts
  the arm64 skip path.

WoA installs were leaving support files and shortcuts but no main executable
even with per-arch NSIS installers; arm64 no longer rewrites the PE at pack time.

Author: rinchen

scripts/electron-builder-after-pack.cjs

@@ -10,6 +10,8 @@
 const fs = require('fs');
 const path = require('path');
 
+const { Arch } = require('builder-util');
+
 // Ref: https://learn.microsoft.com/en-us/windows/win32/menurc/resource-types
 const RT_MANIFEST_TYPE = 24;
 
@@ -18,6 +20,17 @@ module.exports = async function electronBuilderAfterPack(context) {
     return;
   }
 
+  const exeName = `${context.packager.appInfo.productFilename}.exe`;
+  const exePath = path.join(context.appOutDir, exeName);
+
+  // resedit regenerate() can produce an ARM64 PE that passes Node parsing but fails to
+  // materialize during NSIS install on Windows 11 ARM (support files land, exe missing).
+  // Keep stock Electron manifest on arm64; longPathAware remains on x64 builds.
+  if (context.arch === Arch.arm64) {
+    console.debug(`[afterPack] Skipping resedit manifest embed on arm64: ${exePath}`);
+    return;
+  }
+
   const manifestPath = path.join(
     __dirname,
     '..',
@@ -29,8 +42,6 @@ module.exports = async function electronBuilderAfterPack(context) {
     throw new Error(`[afterPack] Missing manifest: ${manifestPath}`);
   }
 
-  const exeName = `${context.packager.appInfo.productFilename}.exe`;
-  const exePath = path.join(context.appOutDir, exeName);
   if (!fs.existsSync(exePath)) {
     throw new Error(`[afterPack] Missing Windows app exe: ${exePath}`);
   }

src/main/windows-long-path-manifest.contract.test.ts

@@ -17,6 +17,8 @@ describe('Windows long-path application manifest (packaging contract)', () => {
     expect(hook).toContain('resedit');
     expect(hook).toMatch(/RT_MANIFEST_TYPE|type === 24/);
     expect(hook).toContain('mesh-client-long-path.manifest.xml');
+    expect(hook).toContain('Arch.arm64');
+    expect(hook).toContain('Skipping resedit manifest embed on arm64');
     expect(hook).toContain('renameSync');
     expect(hook).toMatch(/\.tmp['"`]/);