fix(sxiv): improve key-handler script with better error handling and usability

- Add set -f to disable globbing
- Fix dmenu directory selection prompt to allow root selection
- Add unique suffix when trash filename exists to avoid overwrite
- Use safer command substitutions with output capture for error reporting
- Reorder commands for clarity and reliability
- Restore and improve wallpaper setting with error messages
- Use xclip with full path and relative path copying feedback
- Add comments about deprecated `convert` usage, suggest `magick`

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