Fix: OAuth clientId missing error in HF Spaces

🐛 Problem:
- Modal shows correctly but OAuth login fails with 'Missing clientId'
- @huggingface/hub library needs proper client configuration

🔧 Solution:
- Added fallback OAuth URL generation for HF Spaces
- Enhanced error handling with try-catch for OAuth calls
- Added detailed debugging for window.huggingface object
- Try default OAuth config if custom scopes fail

🔍 Debug Info Added:
- Log complete huggingface object structure
- Show available variables and OAuth scopes
- Better error messages for OAuth failures

This should resolve the OAuth client configuration issues.

frontend/src/context/AuthContext.tsx

@@ -149,17 +149,17 @@ export function AuthProvider({ children }: { children: ReactNode }) {
         dispatch({ type: "AUTH_SUCCESS", payload: normalizedResult });
       } else {
         // No OAuth redirect found, check if we need to show auth modal
-        
+
         // Enhanced HF Spaces detection with debugging
-        const isHFSpaces = 
+        const isHFSpaces =
           // Method 1: Check for window.huggingface
           (window.huggingface && window.huggingface.variables) ||
           // Method 2: Check for HF-specific URL patterns
-          window.location.hostname.includes('hf.space') ||
-          window.location.hostname.includes('huggingface.co') ||
+          window.location.hostname.includes("hf.space") ||
+          window.location.hostname.includes("huggingface.co") ||
           // Method 3: Check for HF-specific environment indicators
           document.querySelector('meta[name="hf:space"]') !== null;
-        
+
         // Debug logging (remove in production)
         console.log("🔍 HF Spaces Environment Check:", {
           hostname: window.location.hostname,
@@ -167,9 +167,12 @@ export function AuthProvider({ children }: { children: ReactNode }) {
           hasVariables: !!(window.huggingface && window.huggingface.variables),
           hasHfMeta: !!document.querySelector('meta[name="hf:space"]'),
           isHFSpaces,
-          href: window.location.href
+          href: window.location.href,
+          huggingfaceObject: window.huggingface,
+          variables: window.huggingface?.variables,
+          oauthScopes: window.huggingface?.variables?.OAUTH_SCOPES,
         });
-        
+
         if (isHFSpaces) {
           // In HF Spaces, we require authentication - show the modal
           console.log("🔐 HF Spaces detected - showing auth modal");
@@ -194,20 +197,42 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     try {
       dispatch({ type: "AUTH_START" });
 
-      // Check if we're in HF Spaces environment  
-      const isHFSpaces = 
+      // Check if we're in HF Spaces environment
+      const isHFSpaces =
         (window.huggingface && window.huggingface.variables) ||
-        window.location.hostname.includes('hf.space') ||
-        window.location.hostname.includes('huggingface.co') ||
+        window.location.hostname.includes("hf.space") ||
+        window.location.hostname.includes("huggingface.co") ||
         document.querySelector('meta[name="hf:space"]') !== null;
 
       if (isHFSpaces) {
-        // Use HF OAuth
+        // Use HF OAuth with proper client configuration
         const scopes =
           window.huggingface?.variables?.OAUTH_SCOPES ||
           "openid profile read-repos";
-        const loginUrl = await oauthLoginUrl({ scopes });
-        window.location.href = loginUrl + "&prompt=consent";
+
+        // In HF Spaces, the OAuth client configuration is handled automatically
+        // We just need to call oauthLoginUrl with scopes
+        try {
+          const loginUrl = await oauthLoginUrl({
+            scopes,
+            // HF Spaces automatically provides clientId when deployed
+          });
+          console.log("🔐 Generated OAuth login URL:", loginUrl);
+          window.location.href = loginUrl + "&prompt=consent";
+        } catch (oauthError) {
+          console.error("OAuth URL generation failed:", oauthError);
+          // Fallback: Try without custom scopes
+          try {
+            const fallbackUrl = await oauthLoginUrl({});
+            console.log("🔄 Using fallback OAuth URL");
+            window.location.href = fallbackUrl + "&prompt=consent";
+          } catch (fallbackError) {
+            console.error("Fallback OAuth also failed:", fallbackError);
+            throw new Error(
+              "OAuth configuration not available in this environment"
+            );
+          }
+        }
       } else {
         // For local development, show a message or redirect to HF
         dispatch({