fix: install script bugs and format

install.sh

@@ -1,40 +1,41 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 folder="dabs"
 venv_dir=".venv"
 
 # Find a suitable Python 3.9+ interpreter
 PYTHON_CMD=""
 for cmd in python3.12 python3.11 python3.10 python3.9 python3 python; do
-    if command -v $cmd &> /dev/null; then
-        version=$($cmd -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')" 2>/dev/null)
-        major=$(echo $version | cut -d '.' -f 1)
-        minor=$(echo $version | cut -d '.' -f 2)
-        if [[ "$major" -ge 3 && "$minor" -ge 9 ]]; then
-            PYTHON_CMD=$cmd
-            break
-        fi
+  if command -v $cmd &>/dev/null; then
+    version=$($cmd -c "import sys; print(f'{sys.version_info.major}.{sys.version_info.minor}')" 2>/dev/null)
+    major=$(echo "$version" | cut -d '.' -f 1)
+    minor=$(echo "$version" | cut -d '.' -f 2)
+    if [[ "$major" -ge 3 && "$minor" -ge 9 ]]; then
+      PYTHON_CMD=$cmd
+      break
     fi
+  fi
 done
 
 if [[ -z "$PYTHON_CMD" ]]; then
-    echo "Python 3.9 or higher is required but not found."
-    echo "Please install Python 3.9+ and ensure it's in your PATH."
-    exit 1
+  echo "Python 3.9 or higher is required but not found."
+  echo "Please install Python 3.9+ and ensure it's in your PATH."
+  exit 1
 fi
 
 echo "Using Python: $PYTHON_CMD ($(${PYTHON_CMD} --version))"
 
 # Create virtual environment if it doesn't exist
 if [[ ! -d "$venv_dir" ]]; then
-    echo "Creating virtual environment in $venv_dir..."
-    $PYTHON_CMD -m venv $venv_dir
+  echo "Creating virtual environment in $venv_dir..."
+  $PYTHON_CMD -m venv $venv_dir
 fi
 
 # Activate virtual environment and install dependencies
-source $venv_dir/bin/activate
+# shellcheck source=/dev/null
+source "$venv_dir/bin/activate"
 echo "Virtual environment activated"
 
-cd $folder
+cd $folder || exit
 pip install -r requirements.txt
-python main.py
+python main.py