refactor: group stow packages into common, mac and kde

Split the packages by platform so each app stays an opt-in Stow package
under common/, mac/ or kde/. KDE gets its own Fastfetch, Helium and
Spectacle packages, and darwin-breeze becomes kde/theme. The READMEs
document stowing a whole group as well as individual packages.

common/zsh/.config/zsh/.zshrc

@@ -0,0 +1,75 @@
+# install zinit
+if ! source "$ZDOTDIR/zinit.zsh"; then
+    print -u2 "zinit: failed to initialize; skipping plugin configuration"
+    return 1
+fi
+
+zinit light zdharma-continuum/zinit-annex-bin-gem-node
+zinit light zdharma-continuum/zinit-annex-binary-symlink
+
+zinit wait lucid light-mode id-as depth'1' for \
+    wintermi/zsh-brew \
+    hlissner/zsh-autopair \
+    Aloxaf/fzf-tab \
+    atinit'zicompinit; zicdreplay -q' \
+        zdharma-continuum/fast-syntax-highlighting \
+    atload'_zsh_autosuggest_start' \
+        zsh-users/zsh-autosuggestions
+
+zinit id-as from'gh-r' lbin'!' completions for \
+    lsd-rs/lsd \
+    micro-editor/micro \
+    mv'**/bat.zsh -> _bat' \
+        @sharkdp/bat
+
+zinit for \
+    id-as \
+    as'completion' \
+    from'gh-r' \
+    mv'**/_fastfetch -> _fastfetch' \
+    atpull'%atclone' \
+    lbin'!**bin/fastfetch -> fastfetch' \
+    @fastfetch-cli/fastfetch
+
+zinit for \
+    id-as \
+    from'gh-r' \
+    atclone'./zoxide init zsh > init.zsh' \
+    atpull'%atclone' \
+    lbin'!' \
+    @ajeetdsouza/zoxide
+
+zinit for \
+    id-as \
+    from'gh-r' \
+    atclone'
+        VP_SELF_SETUP_NO_MODIFY_PATH=1 ./vp env setup --refresh > /dev/null; \
+        ./vp env on > /dev/null; \
+        VP_COMPLETE=zsh "$XDG_DATA_HOME/vite-plus/bin/vp" > init.zsh;
+    ' \
+    atpull'%atclone' \
+    atload'source "$XDG_CONFIG_HOME/vite-plus/env"' \
+    @voidzero-dev/vite-plus
+
+zinit for \
+    id-as \
+    from'gh-r' \
+    atclone'
+        ./starship init zsh > init.zsh; \
+        ./starship completions zsh > _starship;
+    ' \
+    atpull'%atclone' \
+    sbin'starship' \
+    @starship/starship
+
+zinit for \
+    id-as \
+    from'gh-r' \
+    atclone'./fzf --zsh > init.zsh' \
+    atpull'%atclone' \
+    lbin'!fzf' \
+    @junegunn/fzf
+
+for script in $ZDOTDIR/config/*.zsh; do
+    source "$script"
+done