fix(ci): skip postinstall scripts to avoid OOM in all workflows

electron-builder install-app-deps rebuilds native modules and uses
too much memory, causing npm install to be killed (exit code 143).

Updated workflows:
- e2e-tests.yml
- test.yml
- pr-check.yml

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/test.yml

@@ -32,7 +32,8 @@ jobs:
       - name: Install dependencies
         # Use npm install instead of npm ci to correctly resolve platform-specific
         # optional dependencies (e.g., @tailwindcss/oxide, lightningcss binaries)
-        run: npm install
+        # Skip scripts to avoid electron-builder install-app-deps which uses too much memory
+        run: npm install --ignore-scripts
 
       - name: Install Linux native bindings
         # Workaround for npm optional dependencies bug (npm/cli#4828)