fix: replace hardcoded strings with localized messages for table of contents functionality

src/js/logic/table-of-contents.ts

@@ -129,7 +129,7 @@ fileInput.addEventListener('change', (e) => {
 
 async function generateTableOfContents() {
   if (!pdfFile) {
-    showStatus('Please select a PDF file first.', 'error');
+    showStatus(t('tools:tableOfContents.selectPdfFirst'), 'error');
     return;
   }
 
@@ -141,11 +141,11 @@ async function generateTableOfContents() {
 
   try {
     generateBtn.disabled = true;
-    showStatus('Reading file (Main Thread)...', 'info');
+    showStatus(t('tools:tableOfContents.statusReadingFileMainThread'), 'info');
 
     const arrayBuffer = await pdfFile.arrayBuffer();
 
-    showStatus('Generating table of contents...', 'info');
+    showStatus(t('tools:tableOfContents.statusGenerating'), 'info');
 
     const title = tocTitleInput.value || t('tools:tableOfContents.name');
     const fontSize = parseInt(fontSizeSelect.value, 10);
@@ -166,7 +166,10 @@ async function generateTableOfContents() {
   } catch (error) {
     console.error('Error reading file:', error);
     showStatus(
-      `Error reading file: ${error instanceof Error ? error.message : 'Unknown error occurred'}`,
+      t('tools:tableOfContents.errorReadingFileWithMessage', {
+        message:
+          error instanceof Error ? error.message : t('common.unknownError'),
+      }),
       'error'
     );
     generateBtn.disabled = false;
@@ -184,7 +187,7 @@ worker.onmessage = (e: MessageEvent<TOCWorkerResponse>) => {
     downloadFile(blob, pdfFile?.name || 'document.pdf');
 
     showStatus(
-      'Table of contents generated successfully! Download started.',
+      t('tools:tableOfContents.successGeneratedDownloadStarted'),
       'success'
     );
 
@@ -195,15 +198,20 @@ worker.onmessage = (e: MessageEvent<TOCWorkerResponse>) => {
     fileDisplayArea.classList.add('hidden');
     generateBtn.disabled = true;
   } else if (e.data.status === 'error') {
-    const errorMessage = e.data.message || 'Unknown error occurred in worker.';
+    const errorMessage = e.data.message || t('common.unknownError');
     console.error('Worker Error:', errorMessage);
-    showStatus(`Error: ${errorMessage}`, 'error');
+    showStatus(
+      t('tools:tableOfContents.workerErrorWithMessage', {
+        message: errorMessage,
+      }),
+      'error'
+    );
   }
 };
 
 worker.onerror = (error) => {
   console.error('Worker error:', error);
-  showStatus('Worker error occurred. Check console for details.', 'error');
+  showStatus(t('tools:tableOfContents.workerErrorOccurred'), 'error');
   generateBtn.disabled = false;
 };