Cache fix issues V2 (#5237)

# Description of Changes

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Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/src/proprietary/routes/Login.test.tsx

@@ -295,9 +295,9 @@ describe('Login', () => {
     await user.click(oauthButton);
 
     await waitFor(() => {
-      // Should use 'authentik' directly, NOT map to 'oidc'
+      // Should use full path directly, NOT map to 'oidc'
       expect(springAuth.signInWithOAuth).toHaveBeenCalledWith({
-        provider: 'authentik',
+        provider: '/oauth2/authorization/authentik',
         options: { redirectTo: '/auth/callback' }
       });
     });
@@ -338,10 +338,10 @@ describe('Login', () => {
     await user.click(oauthButton);
 
     await waitFor(() => {
-      // Should use 'mycompany' directly - this is the critical fix
+      // Should use full path directly - this is the critical fix
       // Previously it would map unknown providers to 'oidc'
       expect(springAuth.signInWithOAuth).toHaveBeenCalledWith({
-        provider: 'mycompany',
+        provider: '/oauth2/authorization/mycompany',
         options: { redirectTo: '/auth/callback' }
       });
     });
@@ -382,9 +382,9 @@ describe('Login', () => {
     await user.click(oauthButton);
 
     await waitFor(() => {
-      // Should use 'oidc' when explicitly configured
+      // Should use full path when explicitly configured
       expect(springAuth.signInWithOAuth).toHaveBeenCalledWith({
-        provider: 'oidc',
+        provider: '/oauth2/authorization/oidc',
         options: { redirectTo: '/auth/callback' }
       });
     });

frontend/src/proprietary/routes/Login.tsx

@@ -109,13 +109,12 @@ export default function Login() {
           updateSupportedLanguages(data.languages, data.defaultLocale);
         }
 
-        // Extract provider IDs from the providerList map
-        // The keys are like "/oauth2/authorization/google" - extract the last part
-        const providerIds = Object.keys(data.providerList || {})
-          .map(key => key.split('/').pop())
-          .filter((id): id is string => id !== undefined);
+        // Use the full paths from providerList as provider identifiers
+        // The backend provides paths like "/oauth2/authorization/google" or "/saml2/authenticate/stirling"
+        // We'll use these full paths so the auth client knows where to redirect
+        const providerPaths = Object.keys(data.providerList || {});
 
-        setEnabledProviders(providerIds);
+        setEnabledProviders(providerPaths);
       } catch (err) {
         console.error('[Login] Failed to fetch enabled providers:', err);
       }

frontend/src/proprietary/routes/login/OAuthButtons.tsx

@@ -26,7 +26,7 @@ interface OAuthButtonsProps {
   onProviderClick: (provider: OAuthProvider) => void
   isSubmitting: boolean
   layout?: 'vertical' | 'grid' | 'icons'
-  enabledProviders?: OAuthProvider[]  // List of enabled provider IDs from backend
+  enabledProviders?: OAuthProvider[]  // List of full auth paths from backend (e.g., '/oauth2/authorization/google', '/saml2/authenticate/stirling')
 }
 
 export default function OAuthButtons({ onProviderClick, isSubmitting, layout = 'vertical', enabledProviders = [] }: OAuthButtonsProps) {
@@ -37,19 +37,24 @@ export default function OAuthButtons({ onProviderClick, isSubmitting, layout = '
     ? Object.keys(oauthProviderConfig)
     : enabledProviders;
 
-  // Build provider list - use provider ID to determine icon and label
-  const providers = providersToShow.map(id => {
-    if (id in oauthProviderConfig) {
+  // Build provider list - extract provider ID from full path for display
+  const providers = providersToShow.map(pathOrId => {
+    // Extract provider ID from full path (e.g., '/saml2/authenticate/stirling' -> 'stirling')
+    const providerId = pathOrId.split('/').pop() || pathOrId;
+
+    if (providerId in oauthProviderConfig) {
       // Known provider - use predefined icon and label
       return {
-        id,
-        ...oauthProviderConfig[id]
+        id: pathOrId,  // Keep full path for redirect
+        providerId,    // Store extracted ID for display lookup
+        ...oauthProviderConfig[providerId]
       };
     }
     // Unknown provider - use generic icon and capitalize ID for label
     return {
-      id,
-      label: id.charAt(0).toUpperCase() + id.slice(1),
+      id: pathOrId,  // Keep full path for redirect
+      providerId,    // Store extracted ID for display lookup
+      label: providerId.charAt(0).toUpperCase() + providerId.slice(1),
       file: GENERIC_PROVIDER_ICON
     };
   });