feat: persistent help tab with keybindings cheat sheet

- Colorized reference card auto-redraws on resize
- Ctrl-A ? jumps to help tab (recreates if closed)
- Fixed tmux config syntax error in capture/logging bindings

config/tmux.conf

@@ -113,8 +113,8 @@ bind -T copy-mode-vi y send -X copy-selection-and-cancel
 bind -T copy-mode-vi MouseDragEnd1Pane send -X copy-selection-and-cancel
 
 # --- Capture & logging ---
-bind S capture-pane -pS - \; save-buffer ~/logs/capture-#{session_name}-#{window_index}-#{pane_index}-#(date +%s).txt \; display "Pane captured to ~/logs/"
-bind L pipe-pane -o "cat >> ~/logs/live-#{session_name}-#{window_index}-#(date +%s).log" \; display "Logging toggled"
+bind S run-shell 'tmux capture-pane -pS - > ~/logs/capture-#S-#I-#P-$(date +%%s).txt && tmux display "Pane captured to ~/logs/"'
+bind L pipe-pane -o 'cat >> ~/logs/live-#S-#I.log' \; display "Logging toggled"
 
 # --- Clipboard ---
 set -g set-clipboard on
@@ -154,5 +154,9 @@ set -g default-terminal "tmux-256color"
 set -ga terminal-overrides ",xterm-256color:Tc"
 set -sg escape-time 10
 
+# --- Help tab shortcut ---
+# Ctrl-A ? = jump to help tab (or recreate if closed)
+bind ? if-shell 'tmux select-window -t help 2>/dev/null' '' 'new-window -n help /opt/sethmux/sethmux-help.sh'
+
 # --- Session startup layout ---
-# Windows created by sethmux-start.sh: code, git, run, logs
+# Windows created by sethmux-start.sh: code, git, run, logs, help