fix(electron): map IPv6 :: wildcard to localhost

[MikeBishop]

Problem

When config.address is set to "::" (listen on all interfaces), the Electron window tries to load http://:::8080 instead of http://localhost:8080, resulting in a blank local display.

Root cause

electron.js remaps wildcard bind addresses to "localhost" for the Electron loadURL call so the local display always connects to the server on the loopback interface. This remap already handled undefined, "", and "0.0.0.0", but "::" was missing.

Note: core.start() is not affected — at the time that check runs, config is initialised from process.env.config (empty {} in normal operation), so config.address is always undefined and the server always starts correctly.

Fix

One line: add (config.address === "::") to the existing wildcard remap in createWindow().

[KristjanESPERANTO]

@MikeBishop Thanks! With IPv6 becoming more widespread, this is a valuable improvement 🙂