Add easier tmux pane controls

config/foot/foot.ini

@@ -17,3 +17,9 @@ blink=no
 clipboard-copy=Control+Insert
 primary-paste=none
 clipboard-paste=Shift+Insert
+
+[text-bindings]
+# Send Shift+Return as CSI-u so TUIs can distinguish it from Return.
+\x1b[13;2u=Shift+Return
+# Send Alt+Shift+Return as CSI-u so tmux can match M-S-Enter.
+\x1b[13;4u=Mod1+Shift+Return