Clean up debugging code and refine error handling

Removed unnecessary `console.log` statements from `pdf-viewer.js`
and `receiver-signature.js` to reduce console output in production.
Simplified error handling in `pdf-viewer.js` for better clarity,
including consolidating error logging and removing redundant
handling for `RenderingCancelledException`.

Deleted the `debugDumpViewerDom` function and its public API
reference from `receiver-signature.js` as part of a cleanup
effort to eliminate unused debugging utilities. Streamlined
code related to event listener management in `pdf-viewer.js`
while retaining core functionality.

EnvelopeGenerator.ReceiverUI/wwwroot/js/pdf-viewer.js

@@ -14,14 +14,9 @@ window.pdfViewer = {
 
     async initialize(canvasId, pdfDataUrl, dotNetRef) {
         try {
-            console.log('PDF.js initialization started for canvas:', canvasId);
-
-            // Store .NET reference for callbacks
             this.dotNetReference = dotNetRef;
 
-            // Wait for PDF.js to load
             if (typeof window.pdfjsLib === 'undefined') {
-                console.error('PDF.js library not loaded, waiting...');
                 await this.waitForPdfJs();
             }
 
@@ -30,32 +25,21 @@ window.pdfViewer = {
 
             this.canvas = document.getElementById(canvasId);
             if (!this.canvas) {
-                console.error('Canvas element not found:', canvasId);
                 return false;
             }
 
-            console.log('Canvas element found, loading PDF...');
-
             this.ctx = this.canvas.getContext('2d');
-
-            // Attach mouse wheel event listener
             this.attachWheelEvent();
 
-            // Load PDF from data URL
             const uint8Array = this.base64ToUint8Array(pdfDataUrl);
-            console.log('PDF data converted to Uint8Array, size:', uint8Array.length);
-
             const loadingTask = pdfjsLib.getDocument({ data: uint8Array });
             this.pdfDoc = await loadingTask.promise;
             this.totalPages = this.pdfDoc.numPages;
 
-            console.log('PDF loaded successfully, total pages:', this.totalPages);
-
-            // Render first page
             await this.renderPage(this.pageNum);
             return true;
         } catch (error) {
-            console.error('Error initializing PDF viewer:', error);
+            console.error('PDF viewer initialization failed:', error);
             return false;
         }
     },
@@ -88,13 +72,11 @@ window.pdfViewer = {
         }, { passive: false });
 
         this.wheelEventAttached = true;
-        console.log('Wheel event listener attached to document body');
     },
 
     async waitForPdfJs() {
         for (let i = 0; i < 50; i++) {
             if (typeof window.pdfjsLib !== 'undefined') {
-                console.log('PDF.js loaded after', i * 100, 'ms');
                 return;
             }
             await new Promise(resolve => setTimeout(resolve, 100));
@@ -136,8 +118,6 @@ window.pdfViewer = {
             const page = await this.pdfDoc.getPage(num);
             const viewport = page.getViewport({ scale: this.scale });
 
-            console.log('Rendering page:', num, 'Viewport:', viewport.width, 'x', viewport.height);
-
             this.canvas.height = viewport.height;
             this.canvas.width = viewport.width;
 
@@ -147,15 +127,12 @@ window.pdfViewer = {
             };
 
             if (this.currentRenderTask) {
-                console.log('Cancelling previous render task');
                 this.currentRenderTask.cancel();
             }
 
             this.currentRenderTask = page.render(renderContext);
             await this.currentRenderTask.promise;
 
-            console.log('Page rendered successfully');
-
             // Restore viewport center position AFTER rendering
             if (container && oldWidth > 0 && oldHeight > 0) {
                 const scaleX = this.canvas.width / oldWidth;
@@ -176,10 +153,8 @@ window.pdfViewer = {
                 this.pageNumPending = null;
             }
         } catch (error) {
-            if (error.name === 'RenderingCancelledException') {
+            if (error.name !== 'RenderingCancelledException') {
-                console.log('Rendering cancelled, will render pending page');
+                console.error('Render error:', error);
-            } else {
-                console.error('Error rendering page:', error);
             }
             this.currentRenderTask = null;
             this.pageRendering = false;
@@ -271,13 +246,9 @@ window.pdfViewer = {
     },
 
     dispose() {
-        // Clean up event listeners
         if (this.wheelEventAttached) {
-            // Note: We can't remove the exact listener without keeping a reference
-            // but we can at least mark it as disposed
             this.wheelEventAttached = false;
             this.dotNetReference = null;
-            console.log('PDF viewer disposed');
         }
     }
 };

EnvelopeGenerator.ReceiverUI/wwwroot/js/receiver-signature.js

@@ -216,18 +216,6 @@ window.receiverSignature = (() => {
         overlayButtons.set(annotationId, { btn: wrapper, signed: isChecked });
     }
 
-    function debugDumpViewerDom() {
-        const wrapper = document.querySelector(VIEWER_WRAPPER_SEL);
-        if (!wrapper) { console.warn('[annot] .receiver-viewer-wrapper not found'); return; }
-        console.group('[annot] viewer DOM snapshot');
-        const cs = new Set();
-        wrapper.querySelectorAll('*').forEach(el => el.classList.forEach(c => cs.add(c)));
-        console.log('classes:', [...cs].sort().join(', '));
-        console.log('scroll container:', document.querySelector(SCROLL_CONTAINER_SEL));
-        console.log('page images:', document.querySelectorAll(PAGE_IMG_SEL));
-        console.groupEnd();
-    }
-
     // ?? Signature Pad ???????????????????????????????????????????????????????
 
     function _pos(canvas, event) {
@@ -332,7 +320,6 @@ window.receiverSignature = (() => {
     return {
         startTyped:                  startTyped,
         installAnnotationCheckboxes: installAnnotationCheckboxes,
-        debugDumpViewerDom:          debugDumpViewerDom,
         initialize:                  initialize,
         initializeTyped:             initializeTyped,
         initializeImage:             initializeImage,