refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/README.md b/dotfiles/common/.zsh/README.md
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+# fzf-tab
+
+[![CI](https://github.com/Aloxaf/fzf-tab/workflows/ci/badge.svg)](https://github.com/Aloxaf/fzf-tab/actions?query=workflow%3Aci)
+[![GitHub license](https://img.shields.io/github/license/Aloxaf/fzf-tab)](https://github.com/Aloxaf/fzf-tab/blob/master/LICENSE)
+
+Replace zsh's default completion selection menu with fzf!
+
+[![asciicast](https://asciinema.org/a/293849.svg)](https://asciinema.org/a/293849)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
+**Table of Contents**
+
+- [fzf-tab](#fzf-tab)
+- [Install](#install)
+    - [Manual](#manual)
+    - [Antigen](#antigen)
+    - [Zinit](#zinit)
+    - [Oh-My-Zsh](#oh-my-zsh)
+    - [Prezto](#prezto)
+- [Usage](#usage)
+    - [Configure](#configure)
+    - [Binary module](#binary-module)
+- [Difference from other plugins](#difference-from-other-plugins)
+- [Compatibility with other plugins](#compatibility-with-other-plugins)
+- [Related projects](#related-projects)
+
+<!-- markdown-toc end -->
+
+# Install
+
+**NOTE: fzf-tab needs to be loaded after `compinit`, but before plugins which will wrap widgets, such as [zsh-autosuggestions](https://github.com/zsh-users/zsh-autosuggestions) or [fast-syntax-highlighting](https://github.com/zdharma/fast-syntax-highlighting)!!**
+
+### Manual
+
+First, clone this repository.
+
+```zsh
+git clone https://github.com/Aloxaf/fzf-tab ~/somewhere
+```
+
+Then add the following line to your `~/.zshrc`.
+
+```zsh
+source ~/somewhere/fzf-tab.plugin.zsh
+```
+
+### Antigen
+
+```zsh
+antigen bundle Aloxaf/fzf-tab
+```
+
+### Zinit
+
+```zsh
+zinit light Aloxaf/fzf-tab
+```
+
+### Oh-My-Zsh
+
+Clone this repository to your custom directory and then add `fzf-tab` to your plugin list.
+
+```zsh
+git clone https://github.com/Aloxaf/fzf-tab ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/fzf-tab
+```
+
+### Prezto
+
+Clone this repository to your contrib directory and then add `fzf-tab` to your module list in `.zpreztorc`.
+
+```zsh
+git clone https://github.com/Aloxaf/fzf-tab $ZPREZTODIR/contrib/fzf-tab
+```
+
+# Usage
+
+Just press <kbd>Tab</kbd> as usual~
+
+Available keybindings:
+
+- <kbd>Ctrl</kdb>+<kdb>Space</kbd>: select multiple results, can be configured by `fzf-bindings` tag
+
+- <kbd>F1</kbd>/<kbd>F2</kbd>: switch between groups, can be configured by `switch-group` tag
+
+- <kbd>/</kbd>: trigger continuous completion (useful when completing a deep path), can be configured by `continuous-trigger` tag
+
+Available commands:
+
+- `disable-fzf-tab`: disable fzf-tab and fallback to compsys
+
+- `enable-fzf-tab`: enable fzf-tab
+
+- `toggle-fzf-tab`: toggle the state of fzf-tab. This is also a zle widget.
+
+## Configure
+
+A common configuration is:
+
+```zsh
+# disable sort when completing `git checkout`
+zstyle ':completion:*:git-checkout:*' sort false
+# set descriptions format to enable group support
+zstyle ':completion:*:descriptions' format '[%d]'
+# set list-colors to enable filename colorizing
+zstyle ':completion:*' list-colors ${(s.:.)LS_COLORS}
+# preview directory's content with exa when completing cd
+zstyle ':fzf-tab:complete:cd:*' fzf-preview 'exa -1 --color=always $realpath'
+# switch group using `,` and `.`
+zstyle ':fzf-tab:*' switch-group ',' '.'
+```
+
+For more information, please see [Wiki#Configuration](https://github.com/Aloxaf/fzf-tab/wiki/Configuration).
+
+## Binary module
+
+By default, fzf-tab uses [zsh-ls-colors](https://github.com/xPMo/zsh-ls-colors) to parse and apply ZLS_COLORS if you have set the `list-colors` tag.
+
+However, it is a pure zsh script and is slow if you have too many files to colorize.
+fzf-tab is shipped with a binary module to speed up this process. You can build it with `build-fzf-tab-module`, then it will be enabled automatically.
+
+# Difference from other plugins
+
+fzf-tab doesn't do "complete", it just shows you the results of the default completion system.
+
+So it works EVERYWHERE (variables, function names, directory stack, in-word completion, etc.).
+And most of your configuration for default completion system is still valid.
+
+# Compatibility with other plugins
+
+Some plugins may also bind "^I" to their custom widget, like [fzf/shell/completion.zsh](https://github.com/junegunn/fzf/blob/master/shell/completion.zsh) or [ohmyzsh/lib/completion.zsh](https://github.com/ohmyzsh/ohmyzsh/blob/master/lib/completion.zsh#L61-L73).
+
+By default, fzf-tab will call the widget previously bound to "^I" to get the completion list. So there is no problem in most cases, unless fzf-tab is initialized before a plugin which doesn't handle the previous binding properly.
+
+So if you find your fzf-tab doesn't work properly, **please make sure it is the last plugin to bind "^I"** (If you don't know what I mean, just put it to the end of your plugin list).
+
+# Related projects
+
+- https://github.com/lincheney/fzf-tab-completion (fzf tab completion for zsh, bash and GNU readline apps)