fix(zsh): correct zshrc syntax, dedupe FZF_DEFAULT_OPTS, remove leaked secrets

- Comment out stray 'Fix fzf interaction' command that broke zsh-vi-mode init
- Fix _fzf_comprun default preview argument
- Merge duplicate FZF_DEFAULT_OPTS; keep height/border/color + tab accept
- Remove duplicate BORG_FUSE_IMPL (kept pyfuse3)
- Replace hardcoded Netbird setup key and Borg passphrase with comments
- Add secrets.env loader and create ~/.config/secrets.env template
- Set XDG_CURRENT_DESKTOP=Niri to match current compositor

zshrc/.zshrc

@@ -17,7 +17,7 @@ source ~/.export.zsh
 
 # CONSOLIDATED FUNCTION: All zsh-vi-mode logic must be in one place [2]
 function zvm_after_init() {
-  Fix fzf interaction
+  # Fix fzf interaction
   source <(fzf --zsh)
 
   # Bind Atuin search for both Insert and Normal modes [9]
@@ -60,7 +60,7 @@ _fzf_comprun() {
   cd) fzf --preview 'eza --tree --color=always {} | head -200' "$@" ;;
   export | unset) fzf --preview "eval 'echo \$' {}" "$@" ;;
   ssh) fzf --preview 'dig {}' "$@" ;;
-  *) fzf --preview "--preview 'bat -n --color=always --line-range :10 {}'" "$@" ;;
+  *) fzf --preview 'bat -n --color=always --line-range :10 {}' "$@" ;;
   esac
 }