Remove unused components and models for improved maintainability

- Deleted redundant components (`AddActionButton`, `AlertBox`, `AlertStack`, `BackButton`, `CancelButton`, and `CollapsableArea`) and related files.
- Removed unused models (`Book`, `BookSerie`, `BookTables`, `Character`, and `Chapter`) to reduce codebase clutter.
- Updated project structure and references to reflect these removals.

lib/utils/tiptap.ts

@@ -0,0 +1,140 @@
+import {TiptapAttrValue, TiptapLinkAttrs, TiptapNode} from "@/lib/types/chapter";
+
+function isTiptapLinkAttrs(value: TiptapAttrValue): value is TiptapLinkAttrs {
+    return typeof value === 'object' && value !== null && 'href' in value;
+}
+
+export function getPageCount(text: string): number {
+    const charactersPerLine: number = 90;
+    const linesPerPage: number = 40;
+    
+    const lines: string[] = text.split('\n');
+    let totalLines: number = 0;
+    
+    lines.forEach((line: string) => {
+        const lineLength: number = line.length;
+        const estimatedLines: number = Math.ceil(lineLength / charactersPerLine);
+        totalLines += estimatedLines;
+    });
+    
+    return Math.ceil(totalLines / linesPerPage);
+}
+
+export function convertTiptapToHTML(node: TiptapNode): string {
+    let html: string = '';
+    
+    switch (node.type) {
+        case 'doc':
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            break;
+        
+        case 'paragraph':
+            html += '<p>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</p>';
+            break;
+        
+        case 'text':
+            let textContent: string = node.text || '';
+            
+            if (node.attrs) {
+                if (node.attrs.bold) {
+                    textContent = `<strong>${textContent}</strong>`;
+                }
+                if (node.attrs.italic) {
+                    textContent = `<em>${textContent}</em>`;
+                }
+                if (node.attrs.underline) {
+                    textContent = `<u>${textContent}</u>`;
+                }
+                if (node.attrs.strike) {
+                    textContent = `<s>${textContent}</s>`;
+                }
+                if (node.attrs.link && isTiptapLinkAttrs(node.attrs.link)) {
+                    textContent = `<a href="${node.attrs.link.href}">${textContent}</a>`;
+                }
+            }
+            
+            html += textContent;
+            break;
+        
+        case 'heading':
+            const level: number = typeof node.attrs?.level === 'number' ? node.attrs.level : 1;
+            html += `<h${level}>`;
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += `</h${level}>`;
+            break;
+        
+        case 'bulletList':
+            html += '<ul>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</ul>';
+            break;
+        
+        case 'orderedList':
+            html += '<ol>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</ol>';
+            break;
+        
+        case 'listItem':
+            html += '<li>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</li>';
+            break;
+        
+        case 'blockquote':
+            html += '<blockquote>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</blockquote>';
+            break;
+        
+        case 'codeBlock':
+            html += '<pre><code>';
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            html += '</code></pre>';
+            break;
+        
+        default:
+            if (node.content) {
+                node.content.forEach((childNode: TiptapNode) => {
+                    html += convertTiptapToHTML(childNode);
+                });
+            }
+            break;
+    }
+    
+    return html;
+}