Consolidate terminal conditionals and add shell integration for bash and cmd.exe

Co-authored-by: DRSDavidSoft <4673812+DRSDavidSoft@users.noreply.github.com>

vendor/git-prompt.sh

@@ -48,6 +48,34 @@ then
   fi
 else
   # Source: github.com/git-for-windows/build-extra/blob/main/git-extra/git-prompt.sh
+  
+  # Setup OSC 133 shell integration for Windows Terminal
+  if [ -n "$WT_SESSION" ]; then
+    __cmder_prompt_command() {
+      local exit_code=$?
+      # OSC 133;D - Mark end of command execution with exit code
+      printf '\e]133;D;%s\a' "$exit_code"
+      # OSC 133;A - Mark start of prompt
+      printf '\e]133;A\a'
+      return $exit_code
+    }
+    
+    # OSC 133;C - Mark start of command output (emitted right before command execution)
+    __cmder_preexec() {
+      printf '\e]133;C\a'
+    }
+    
+    # Append to PROMPT_COMMAND to emit sequences before each prompt
+    if [ -z "$PROMPT_COMMAND" ]; then
+      PROMPT_COMMAND="__cmder_prompt_command"
+    else
+      PROMPT_COMMAND="__cmder_prompt_command;$PROMPT_COMMAND"
+    fi
+    
+    # Use DEBUG trap to emit OSC 133;C before command execution
+    trap '__cmder_preexec' DEBUG
+  fi
+  
   PS1='\[\033]0;${TITLEPREFIX:+$TITLEPREFIX:}${PWD//[^[:ascii:]]/?}\007\]' # set window title to TITLEPREFIX (if set) and current working directory
   # PS1="$PS1"'\n'               # new line (disabled)
   PS1="$PS1"'\[\033[32m\]'       # change to green and bold
@@ -80,6 +108,11 @@ else
   PS1="$PS1"'\[\033[30;1m\]'     # change color to grey in bold
   PS1="$PS1"'λ '                 # prompt: Cmder uses λ
   PS1="$PS1"'\[\033[0m\]'        # reset color
+  
+  # OSC 133;B - Mark start of command input (Windows Terminal only)
+  if [ -n "$WT_SESSION" ]; then
+    PS1="$PS1"'\[\e]133;B\a\]'
+  fi
 fi
 
 MSYS2_PS1="$PS1"                 # for detection by MSYS2 SDK's bash.basrc