fixed generating flashcard blank screen bug

Author: ItzOso

src/pages/FlashcardsViewer.jsx

@@ -148,9 +148,9 @@ function FlashcardsViewer() {
           <button
             onClick={() => handleGenerateFlashcards()}
             disabled={
-              !note.content.trim() ||
+              !note?.content.trim() ||
               isGenerating ||
-              note.content.trim().split(/\s+/).length < 70
+              note?.content.trim().split(/\s+/).length < 70
             }
             className="group btn-primary btn-icon whitespace-nowrap"
           >
@@ -162,7 +162,7 @@ function FlashcardsViewer() {
             <span>Regenerate Flashcards</span>
 
             {/* Tooltip inside the button */}
-            {!isGenerating && note.content.trim().split(/\s+/).length < 70 && (
+            {!isGenerating && note?.content.trim().split(/\s+/).length < 70 && (
               <div className="absolute left-1/2 -top-10 transform -translate-x-1/2 bg-black text-white text-xs rounded py-1 px-2 opacity-0 group-hover:opacity-100 transition-opacity whitespace-nowrap pointer-events-none">
                 Requires at least 70 words
               </div>

src/pages/NotesPage.jsx

@@ -206,7 +206,9 @@ function NotesPage() {
 
       // if (userData.usagesLeft <= 0 && nextReset - new Date() >= 0) {
       toast.success(
-        `Summary generated! ${userData.usagesLeft - 1} credits remaining.`
+        `Summary generated! ${
+          userData.usagesLeft == -1 ? "4" : userData.usagesLeft - 1
+        } credits remaining.`
       );
     } catch (error) {
       // no more usages left