Add better error logging for inventory sync debugging

Author: rainerstudios

src/inventorySync.js

@@ -70,10 +70,21 @@
                 });
 
                 if (!response.ok) {
-                    throw new Error(`Steam API returned ${response.status}. Make sure you're logged into Steam.`);
+                    const text = await response.text();
+                    this.log(`❌ Steam API error ${response.status}:`, text.substring(0, 200));
+                    throw new Error(`Steam API returned ${response.status}. Make sure you're logged into Steam and your inventory is public.`);
                 }
 
-                const data = await response.json();
+                const text = await response.text();
+                this.log('📋 Response preview:', text.substring(0, 200));
+
+                let data;
+                try {
+                    data = JSON.parse(text);
+                } catch (parseError) {
+                    this.log('❌ Failed to parse JSON. Response was:', text.substring(0, 500));
+                    throw new Error('Steam returned HTML instead of JSON. Check:\n1. You are logged into Steam\n2. Your inventory is set to Public\n3. Try refreshing the page');
+                }
 
                 if (!data.assets || !data.descriptions) {
                     throw new Error('Invalid inventory response from Steam');