Adds release based on Ubuntu 26.04 LTS 'Resolute' for best support of new hardware; the prior release Rescuezilla 2.6.1 (2025-07-16) left the default release using Ubuntu 24.10 'Oracular' which only provided hardware support to circa October 2024, despite it introducing a release based on Ubuntu 25.04 'Plucky'; adds release based on the end-of-life Ubuntu 25.10 'Questing' as a backfill; fixed blank error message window displayed after cloning (even on success), which causes the cancellation of the post-operation shutdown/restart request; fixed graphical shutdown menu not opening on the 'Plucky variant due to missing item in custom rules file for Polkit authentication manager; upgraded to latest Partclone 0.3.47; temporarily disables the 32-bit (Intel i386) build based on Ubuntu 18.04 'Bionic'; temporarily disables older 64-bit build based on Ubuntu 22.04 'Jammy', Ubuntu 24.04 'Noble' and Ubuntu 25.04 'Plucky'. Notably NOT included in this release - an arm64 build, or planned major overhaul to Image Explorer using indexed-gzip and improved UI. That's coming next release.