config(fish): add full fish config from live home; portable clipboard + env guards

Keep starship prompt (omp migration rejected). cpy/pst aliases branch on
wl-copy vs pbcopy; functions use the aliases. BROWSER/CHROME_EXECUTABLE
guarded on binary existence. auto-Niri.fish and cp-appid.fish are
linux-only (gated in .chezmoiignore).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dot_config/fish/conf.d/10-env.fish

@@ -19,8 +19,8 @@ set -gx CODE_ROOT $HOME/Developer
 set -gx GITEA_LOGIN code.sonr.org
 set -gx GITLAB_HOST git.sonr.org
 
-set -gx BROWSER /usr/bin/brave-origin-nightly
-set -gx CHROME_EXECUTABLE /usr/bin/chromium
+test -x /usr/bin/brave-origin-nightly; and set -gx BROWSER /usr/bin/brave-origin-nightly
+test -x /usr/bin/chromium; and set -gx CHROME_EXECUTABLE /usr/bin/chromium
 # Puppeteer / CDP tools — chrome-headless-shell via @puppeteer/browsers,
 # symlinked from ~/.config/chrome-headless-shell/<version>/ into ~/.local/bin.
 # NOTE: omp's browser tool prefers detected system Chrome over this env var;

dot_config/fish/conf.d/20-aliases.fish

@@ -13,20 +13,25 @@ alias e.t 'nvim ~/.config/tmux/tmux.conf'
 alias hx 'helix'
 
 # Quick directory jumps
-alias cdc 'cd /home/prad/.config && yazi'
-alias cdd 'cd /home/prad/Developer && yazi'
-alias cdk 'cd /home/prad/Documents/Knowledge && obsidian'
-alias cdl 'cd /home/prad/.local && yazi'
-alias cds 'cd /home/prad/.local/share/services && ls'
-alias cdw 'cd /home/prad/Downloads && yazi'
+alias cdc 'cd ~/.config && yazi'
+alias cdd 'cd ~/Developer && yazi'
+alias cdk 'cd ~/Documents/Knowledge && obsidian'
+alias cdl 'cd ~/.local && yazi'
+alias cds 'cd ~/.local/share/services && ls'
+alias cdw 'cd ~/Downloads && yazi'
 
 # Tools
 alias dd lazydocker
 alias gg lazygit
 alias ff 'exec fish'
 alias npx bunx
-alias cpy wl-copy
-alias pst wl-paste
+if command -v wl-copy >/dev/null 2>&1
+    alias cpy wl-copy
+    alias pst wl-paste
+else if command -v pbcopy >/dev/null 2>&1
+    alias cpy pbcopy
+    alias pst pbpaste
+end
 alias sm 'sudo micro'
 # q exits the shell; if this shell was spawned from yazi's own `q` bind
 # (`shell "$SHELL" --block`), also tell that yazi to quit so exiting