fix(linux): restore app icon on Wayland

[zortos293]

Fixes #707.

Electron's Linux window identity did not match an installed desktop entry, so KDE/Wayland could not associate the AppImage window with OpenNOW and displayed the generic Wayland icon.

• define a stable reverse-DNS desktopName and synchronize the generated desktop filename and StartupWMClass
• bundle the OpenNOW logo as a runtime resource and set it explicitly on Linux windows, including direct AppImage launches without desktop integration

Verification:

• npm run typecheck
• npx oxlint src/main/window/mainWindow.ts
• npm run build
• npm test (449 passed)
• packaged and extracted the Linux AppImage; verified com.zortos.opennow.stable.desktop, matching StartupWMClass, and bundled resources/app-icon.png
• launched the packaged Linux app and verified its runtime WM class is com.zortos.opennow.stable

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