Use Noctalia overlays for terminal themes

[CollieIsCute]

Summary

• add Noctalia user templates for Alacritty and Ghostty
• keep Catppuccin as the fallback terminal theme
• load Noctalia-generated theme files as optional overlays instead of letting Noctalia mutate main configs
• document the shared terminal theme ownership model

Research

• Alacritty general.import loads imports in order and skips missing files, so ~/.config/alacritty/themes/noctalia.toml can be an optional overlay after Catppuccin.
• Ghostty config-file = ?path ignores missing files and is processed after the main config, so config-file = ?themes/noctalia can overlay the Catppuccin fallback.
• Noctalia built-in terminal templates use apply.sh hooks that edit app main config files; these changes avoid those hooks by using user templates that only write generated theme files.

Local state cleanup

• Cleared the local Noctalia runtime template state so old built-in/community IDs no longer linger in ~/.local/state/noctalia/settings.toml.
• Kept other Noctalia GUI state intact.

Validation

• chezmoi apply -v
• chezmoi diff
• chezmoi status
• noctalia config validate /home/collie/.config/noctalia
• noctalia theme /home/collie/.config/wallpapers/xp_wallpaper.jpg -r /home/collie/.config/noctalia/templates/alacritty.toml:/tmp/opencode/noctalia-alacritty.toml
• noctalia theme /home/collie/.config/wallpapers/xp_wallpaper.jpg -r /home/collie/.config/noctalia/templates/ghostty:/tmp/opencode/noctalia-ghostty
• noctalia theme /home/collie/.config/wallpapers/xp_wallpaper.jpg -r /home/collie/.config/noctalia/templates/kitty.conf:/tmp/opencode/noctalia-kitty.conf
• noctalia theme /home/collie/.config/wallpapers/xp_wallpaper.jpg -c /home/collie/.config/noctalia/config.toml
• python -c "import tomllib; tomllib.load(open('/home/collie/.local/share/chezmoi/home/dot_config/alacritty/alacritty.toml','rb')); tomllib.load(open('/home/collie/.local/share/chezmoi/home/dot_config/noctalia/templates/alacritty.toml','rb')); tomllib.load(open('/tmp/opencode/noctalia-alacritty.toml','rb'))"
• ghostty +show-config | rg '^(theme|config-file|background|foreground|palette = 0|palette = 15)'
• git diff --check