Fedora installer, cleanup and screenshots

- install.sh rewritten for Fedora: dry-run, --check, backups, oh-my-zsh, lazygit, swappy
- outputs-setup.sh (monitor layout for new hardware) and doctor.sh (health check)
- screenshot.sh: region / full / window / scroll / last / edit (swappy), saved and copied
- remove waybar, swaync, dunst, rofi and their helper scripts, wallpaper picker, mirror.sh
- wallpapers handled by DMS; keep only the favourite one
- 00-session.conf for portals; swayfx-only layer rules split into 21-dms-effects.conf

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.config/swappy/config

@@ -0,0 +1,8 @@
+[Default]
+save_dir=$HOME/Pictures/Screenshots
+save_filename_format=screenshot_%Y-%m-%d_%H-%M-%S_edited.png
+early_exit=true
+auto_save=false
+show_panel=true
+line_size=5
+text_size=20