feat(linux): add wrapper script to force XWayland and support user flags

[DamianPala]

Summary

Electron can't position overlay windows, control always-on-top, or prevent focus stealing on Wayland. This is an xdg-shell protocol limitation, not a compositor bug, and it hits every compositor the same way (electron#48749, electron#12445). Electron's own docs say to use --ozone-platform=x11 for apps that need these capabilities.

appendSwitch() from PR #470 doesn't work on Electron 39+ because the ozone platform is picked during Chromium init, before any JS runs. VS Code ran into the same thing (microsoft/vscode#135191).

This adds an afterPack hook that wraps the Linux binary in a bash script. Same approach as the Chromium wrapper script used by Chrome and Brave on Linux (google-chrome calls chrome, brave-browser calls brave). The wrapper forces XWayland on Wayland sessions and reads user flags from ~/.config/open-whispr-flags.conf (one per line, # comments, same format as chrome-flags.conf).

Supersedes the self-relaunch from PR #495 (no extra PID, Ctrl+C works, no startup overhead, user-configurable flags).

Changes

scripts/afterPack.js, electron-builder hook (Linux only). Renames open-whispr to open-whispr-app, writes a bash wrapper as open-whispr that:

1. Adds --ozone-platform=x11 when XDG_SESSION_TYPE=wayland
2. Reads ~/.config/open-whispr-flags.conf for user flags (one per line, # comments)
3. exec -a "$0" into the real binary (replaces the process, ps shows open-whispr)

Putting --ozone-platform=wayland in flags.conf overrides the default (last flag wins).

Test plan

Build:

• npm run build:linux -- --publish never --linux dir deb rpm
• file dist/linux-unpacked/open-whispr shows bash script
• file dist/linux-unpacked/open-whispr-app shows ELF
• dpkg -c *.deb | grep open-whispr shows both files in /opt/OpenWhispr/

XWayland (verified with xlsclients | grep -i whispr and ps aux | grep open-whispr showing --ozone-platform=x11):

• Ubuntu 24.04 LTS, GNOME Wayland, deb, XWayland, bubble in corner
• Kubuntu 24.04 LTS, KDE Plasma Wayland, deb, XWayland, bubble in corner
• Kubuntu 25.10, KDE Plasma Wayland, unpacked + deb, XWayland
• Fedora 41 KDE spin, KDE Plasma Wayland, rpm, XWayland, bubble in corner

flags.conf:

• --ozone-platform=wayland in flags.conf forces native Wayland (last flag wins)
• Removing the file falls back to XWayland

No regression:

• X11 session (Kubuntu 24.04 KDE): no --ozone-platform flag added
• macOS/Windows: unaffected (hook returns early on non-Linux)

Refs #495, #470