refactor: replace sendmail with curl for Gmail notifications

notify.sh

@@ -40,21 +40,25 @@ send_ntfy() {
 # Function: Send to Gmail
 send_gmail() {
   if [ -n "$GMAIL_USER" ] && [ -n "$GMAIL_TO" ] && [ -n "$GMAIL_PASS" ]; then
-    if ! command -v sendmail &> /dev/null; then
-      echo "[Gmail] Warning: sendmail not found, skipping."
-      return
-    fi
     echo "[Gmail] Sending..."
-    {
-      echo "Subject: $ICON $TITLE"
-      echo "From: $GMAIL_USER"
-      echo "To: $GMAIL_TO"
-      echo ""
-      echo "$MESSAGE"
-    } | sendmail -S smtp.gmail.com:587 \
-        -au"$GMAIL_USER" \
-        -ap"$GMAIL_PASS" \
-        "$GMAIL_TO" && echo "[Gmail] Sent." || echo "[Gmail] Failed."
+
+    # Send via curl (portable, no sendmail needed)
+    if curl -s --url "smtps://smtp.gmail.com:465" --ssl-reqd \
+      --user "$GMAIL_USER:$GMAIL_PASS" \
+      --mail-from "$GMAIL_USER" \
+      --mail-rcpt "$GMAIL_TO" \
+      --upload-file - <<EOF
+From: $GMAIL_USER
+To: $GMAIL_TO
+Subject: $ICON $TITLE
+
+$MESSAGE
+EOF
+    then
+      echo "[Gmail] Sent."
+    else
+      echo "[Gmail] Failed."
+    fi
   fi
 }