[Feature] Electron 21→43 upgrade, preload bridge fix, and CI modernization

.github/workflows/build.yml

@@ -2,72 +2,102 @@ name: Build
 on: [push, pull_request]
 
 jobs:
+  smoke_test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out Git repository
+      uses: actions/checkout@v4
+
+    - name: Install Node.js and NPM
+      uses: actions/setup-node@v4
+      with:
+        node-version: 22
+        cache: npm
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Pre-download Electron binary
+      run: node node_modules/electron/install.js
+
+    - name: Run Electron smoke test
+      run: xvfb-run -a npm test
+
   build_on_linux:
     runs-on: ubuntu-latest
     steps:
     - name: Check out Git repository
-      uses: actions/checkout@v1
+      uses: actions/checkout@v4
 
     - name: Install libarchive-tools for pacman
       run: |
         sudo apt-get update -y && sudo apt-get install -y libarchive-tools
 
-    - name: Install Node.js, NPM and Yarn
-      uses: actions/setup-node@v1
+    - name: Install Node.js and NPM
+      uses: actions/setup-node@v4
       with:
-        node-version: 18
+        node-version: 22
+        cache: npm
 
-    - name: Build/release Electron app
-      uses: samuelmeuli/action-electron-builder@v1
-      with:
-        # GitHub token, automatically provided to the action
-        # (No need to define this secret in the repo settings)
-        github_token: ${{ secrets.github_token }}
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build Electron app
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run build
 
-        # If the commit is tagged with a version (e.g. "v1.0.0"),
-        # release the app after building
-        release: ${{ startsWith(github.ref, 'refs/tags/v') }}
+    - name: Build & release Electron app
+      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run release
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
   build_on_mac:
     runs-on: macos-latest
     steps:
     - name: Check out Git repository
-      uses: actions/checkout@v1
+      uses: actions/checkout@v4
 
-    - name: Install Node.js, NPM and Yarn
-      uses: actions/setup-node@v1
+    - name: Install Node.js and NPM
+      uses: actions/setup-node@v4
       with:
-        node-version: 18
+        node-version: 22
+        cache: npm
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build Electron app
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run build
+
+    - name: Build & release Electron app
+      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run release
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-    - name: Build/release Electron app
-      uses: samuelmeuli/action-electron-builder@v1
-      with:
-        # GitHub token, automatically provided to the action
-        # (No need to define this secret in the repo settings)
-        github_token: ${{ secrets.github_token }}
-
-        # If the commit is tagged with a version (e.g. "v1.0.0"),
-        # release the app after building
-        release: ${{ startsWith(github.ref, 'refs/tags/v') }}
-
   build_on_win:
     runs-on: windows-latest
     steps:
     - name: Check out Git repository
-      uses: actions/checkout@v1
+      uses: actions/checkout@v4
 
-    - name: Install Node.js, NPM and Yarn
-      uses: actions/setup-node@v1
+    - name: Install Node.js and NPM
+      uses: actions/setup-node@v4
       with:
-        node-version: 18
+        node-version: 22
+        cache: npm
 
-    - name: Build/release Electron app
-      uses: samuelmeuli/action-electron-builder@v1
-      with:
-        # GitHub token, automatically provided to the action
-        # (No need to define this secret in the repo settings)
-        github_token: ${{ secrets.github_token }}
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build Electron app
+      if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run build
 
-        # If the commit is tagged with a version (e.g. "v1.0.0"),
-        # release the app after building
-        release: ${{ startsWith(github.ref, 'refs/tags/v') }}
+    - name: Build & release Electron app
+      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      run: npm run release
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,6 +1,9 @@
 /node_modules/
 /node_modules/*
 /release_builds/
+/dist/
+/test-results/
+/playwright-report/
 build_installer.js
 test.html
 instanceHistory.json

.nvmrc

@@ -0,0 +1 @@
+22

README.md

@@ -23,6 +23,8 @@ DropPoint helps you drag content without having to open side-by-side windows
 
 Works on **Windows**, **Linux** and **MacOS**.
 
+> **Minimum OS versions:** Windows 10 or later, macOS 12 (Monterey) or later, and a modern 64-bit Linux distribution. Older releases (pre-`1.3.x`) are available for legacy systems on the [Releases Page](https://github.com/GameGodS3/DropPoint/releases).
+
 ## Table of Contents
 - [:sparkles: Demo](#sparkles-demo)
   * [Across maximized windows in the same desktop](#across-maximized-windows-in-the-same-desktop)
@@ -67,7 +69,9 @@ Go to the [Releases Page](https://github.com/GameGodS3/DropPoint/releases) to do
 
 ## :gear: Developer Installation
 
-**You must have NPM and Git installed in your PC**
+**You must have Node.js and Git installed in your PC.**
+
+> Use **Node.js 22 LTS** (the version this project is built and tested against — see `.nvmrc`). Newer non-LTS "Current" releases such as Node 26 have ESM module-resolution regressions that break Electron's binary install (`@electron/get` fails to load `sumchecker`). If you use [nvm](https://github.com/nvm-sh/nvm), run `nvm use`.
 
 1. Clone repo and change into directory
    ```bash