v1.2.1-rc.3 - updated webview id, pacman package, discord ipc on flatpak/snap confined environemnts

Changes

• feat: enhance release download panel with multi-channel support (be69114)
• chore: update GitHub Actions workflows for documentation and release processes (28e65c3)
• chore: add support for Linux Pacman package in downloads and electron-builder configuration (b5d223a)
• feat: implement user agent handling for Chrome compatibility (43584ad)
• chore: add support for Linux Flatpak and Snap downloads (b801e9e)
• chore: enhance Discord IPC handling and update Flatpak configuration (078e9d4)