Replace CopyQ with cliphist (Wayland-native clipboard manager) (flakes-yyox)

Replace CopyQ (XWayland) with cliphist for Wayland-native clipboard history. Adds fuzzel picker keybinding, television cable channel, and fish function.

Summary of Changes

• Deleted mixins/home/gui/linux/services/copyq.nix (removed CopyQ with forceXWayland)
• Created mixins/home/gui/linux/services/cliphist.nix (enables cliphist service)
• Added Mod+V keybinding in niri config to open fuzzel clipboard history picker
• Added xdg.configFile for television cable channel in modules/home/programs/television.nix
• Created modules/home/programs/fish/functions/clip.fish for tv-based clipboard selection
• Added tc abbreviation in modules/home/programs/fish/abbrs.nix