Fix install script and update .gitignore

Correct STATE_DIR to project dir, remove unnecessary pip3 check and ENV_FILE
replacement for cleaner, accurate installation.

Changes:
- Set STATE_DIR to ./state in install.sh
- Remove pip3 dependency check (included in venv)
- Remove redundant ENV_FILE sed replacement
- Update .gitignore to ignore state/ directory

install.sh

@@ -13,7 +13,7 @@ NC='\033[0m' # No Color
 
 # Default paths
 PROJECT_DIR="$(pwd)"
-STATE_DIR="$HOME/.config/email_forwarder"
+STATE_DIR="./state"
 ENV_FILE="./.env"
 
 # Functions
@@ -23,10 +23,6 @@ check_dependencies() {
         echo -e "${RED}Error: python3 not found. Please install Python 3.${NC}"
         exit 1
     fi
-    if ! command -v pip3 &> /dev/null; then
-        echo -e "${RED}Error: pip3 not found. Please install pip.${NC}"
-        exit 1
-    fi
     if ! command -v systemctl &> /dev/null; then
         echo -e "${RED}Error: systemctl not found. Systemd required.${NC}"
         exit 1
@@ -64,7 +60,6 @@ setup_systemd() {
 
     # Replace placeholders
     sed -i "s|/path/to/your/email_forwarder|$PROJECT_DIR|g" "$HOME/.config/systemd/user/email_forwarder.service.d/override.conf"
-    sed -i "s|./.env|$ENV_FILE|g" "$HOME/.config/systemd/user/email_forwarder.service.d/override.conf"
 
     # Reload systemd
     systemctl --user daemon-reload