fix: change tmux prefix to Ctrl+a to match UI

Author: devatnull

backend/containers/tmux.conf

@@ -1,5 +1,8 @@
 # tmux configuration for learning
-# Using Ctrl-b as prefix (default)
+# Using Ctrl-a as prefix (easier to reach than Ctrl-b)
+unbind C-b
+set -g prefix C-a
+bind C-a send-prefix
 
 # Enable mouse support (good for beginners)
 set -g mouse on
@@ -39,7 +42,9 @@ bind l select-pane -R
 
 # Easier splits (more intuitive)
 bind | split-window -h -c "#{pane_current_path}"
+bind \\ split-window -h -c "#{pane_current_path}"
 bind - split-window -v -c "#{pane_current_path}"
+bind _ split-window -v -c "#{pane_current_path}"
 
 # Reload config
 bind r source-file ~/.tmux.conf \; display "Config reloaded!"