Add bot protection warning, 30-sec intervals, longer page wait

- Send Discord ping when 0 products found (likely bot protection)
- Allow 0.5 minute (30 second) check intervals
- Increase page wait from 5s to 10s for slow loads

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

chrome-extension/background.js

@@ -40,10 +40,12 @@ chrome.alarms.onAlarm.addListener((alarm) => {
 
 // Setup periodic alarm
 function setupAlarm() {
+  // Chrome minimum is 0.5 minutes (30 seconds) for packed extensions
+  const interval = Math.max(0.5, config.checkIntervalMinutes);
   chrome.alarms.create("stockCheck", {
-    periodInMinutes: config.checkIntervalMinutes
+    periodInMinutes: interval
   });
-  console.log(`Alarm set for every ${config.checkIntervalMinutes} minute(s)`);
+  console.log(`Alarm set for every ${interval} minute(s) (${interval * 60} seconds)`);
 }
 
 // Load config from storage
@@ -87,6 +89,15 @@ async function runStockCheck() {
   for (const url of config.urls) {
     try {
       const products = await fetchAndParseProducts(url);
+
+      // Alert if 0 products found - likely bot protection
+      if (products.length === 0) {
+        console.warn("WARNING: 0 products found - possible bot protection!");
+        await sendWarningNotification("Bot Protection Detected",
+          "Found 0 products - you may need to manually verify you're human on PokemonCenter.com");
+        continue;
+      }
+
       const { newProducts, restockedProducts } = processProducts(products);
 
       // Send notifications
@@ -147,7 +158,7 @@ async function fetchAndParseProducts(url) {
 
       // Give extra time for dynamic content to load
       console.log("Waiting for dynamic content...");
-      await new Promise(r => setTimeout(r, 5000));
+      await new Promise(r => setTimeout(r, 10000)); // 10 seconds for slow loads
 
       // Send message to content script to extract products
       let products = [];
@@ -225,6 +236,39 @@ function processProducts(products) {
   return { newProducts, restockedProducts };
 }
 
+// Send warning notification (for bot protection, errors, etc.)
+async function sendWarningNotification(title, message) {
+  if (!config.discordWebhook) {
+    console.log("No Discord webhook configured");
+    return;
+  }
+
+  const embed = {
+    title: `⚠️ ${title}`,
+    description: message,
+    color: 0xFF6600, // Orange for warnings
+    footer: { text: "Pokemon Stock Monitor (Chrome Extension)" },
+    timestamp: new Date().toISOString()
+  };
+
+  try {
+    const response = await fetch(config.discordWebhook, {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        content: "@everyone",
+        embeds: [embed]
+      })
+    });
+
+    if (response.ok) {
+      console.log(`Warning notification sent: ${title}`);
+    }
+  } catch (error) {
+    console.error("Error sending warning notification:", error);
+  }
+}
+
 // Send Discord notification
 async function sendDiscordNotification(product, alertType) {
   if (!config.discordWebhook) {