fix(desktop): ensure Electron binary before predev via install.js

[JackLuguibin]

Issue for this PR

Closes #26204

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Before predev runs, we check whether the Electron OS binary was downloaded by looking for path.txt under packages/desktop/node_modules/electron (that file is created after a successful install.js / postinstall). If it is missing—e.g. fresh clone, installs with scripts skipped, or a broken partial install—we run node install.js in that directory to fetch the platform binary, then continue with the existing copy-icons and build-node steps. That way predev fails less often with “no Electron binary” errors buried in later commands.

How did you verify your code works?

Remove or temporarily delete node_modules/electron/path.txt under packages/desktop, run whatever invokes predev, and confirm the script logs the missing-binary message, runs install.js, recreates path.txt, and completes the rest of predev. On a machine where Electron is already installed correctly, confirm the install path is skipped because path.txt exists.

Screenshots / recordings

N/A (not a UI change).

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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