Revert "fix(zsh): indicate vi mode in prompt"

This reverts commit a194d840244f86a1a5dde20cb5fd9ab73a381a12.

zsh/rc

@@ -44,21 +44,18 @@ bindkey -a '_' vi-first-non-blank
 # shellcheck disable=SC2034
 zle_highlight=(region:bg=#323641)
 
-# Vi mode indicator in prompt
+# Change cursor shape based on vi mode
 function zle-keymap-select {
-    if [[ ${KEYMAP} == vicmd ]]; then
-        VI_MODE_INDICATOR="%F{yellow}N%f"
-    else
-        VI_MODE_INDICATOR=""
+    if [[ ${KEYMAP} == main ]]; then
+        echo -ne '\e[5 q'  # Beam cursor for insert mode
+    elif [[ ${KEYMAP} == vicmd ]]; then
+        echo -ne '\e[1 q'  # Block cursor for command mode
     fi
-    zle reset-prompt
 }
 zle -N zle-keymap-select
 
 function zle-line-init {
-    # shellcheck disable=SC2034
-    VI_MODE_INDICATOR=""
-    zle reset-prompt
+    echo -ne '\e[5 q'  # Beam cursor for insert mode
 }
 zle -N zle-line-init