Add gap between tmux session name and window tags

- Adds space after session name to match window tag spacing
- Creates consistent visual separation in status bar
- Improves overall status bar readability

🤖 Generated with [Claude Code](https://claude.ai/code)

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

modules/tmux.nix

@@ -41,7 +41,7 @@
       # Status bar content
       set -g status-left-length 40
       set -g status-right-length 30
-      set -g status-left '#{?client_prefix,#[bg=#fb4934],#[bg=#a89984]}#[fg=#282828] #S #[default]'
+      set -g status-left '#{?client_prefix,#[bg=#fb4934],#[bg=#a89984]}#[fg=#282828] #S #[default] '
       set -g status-right '#{?pane_in_mode,[COPY],} %H:%M '
       
       # Window status format