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.

components/form/TextInput.tsx

@@ -1,4 +1,12 @@
-import {ChangeEvent} from "react";
+import React, {ChangeEvent} from "react";
+
+type InputSize = 'sm' | 'md' | 'lg';
+
+const sizeClasses: Record<InputSize, string> = {
+    sm: 'px-3 py-1.5 text-xs rounded-lg',
+    md: 'px-4 py-2.5 text-sm rounded-xl',
+    lg: 'px-5 py-3 text-base rounded-xl',
+};
 
 interface TextInputProps {
     value: string;
@@ -7,6 +15,7 @@ interface TextInputProps {
     readOnly?: boolean;
     disabled?: boolean;
     onFocus?: () => void;
+    size?: InputSize;
 }
 
 export default function TextInput(
@@ -16,7 +25,8 @@ export default function TextInput(
         placeholder,
         readOnly = false,
         disabled = false,
-        onFocus
+        onFocus,
+        size = 'md'
     }: TextInputProps) {
     return (
         <input
@@ -27,13 +37,7 @@ export default function TextInput(
             disabled={disabled}
             placeholder={placeholder}
             onFocus={onFocus}
-            className={`w-full bg-secondary/50 text-text-primary px-4 py-2.5 rounded-xl border border-secondary/50
-                focus:border-primary focus:ring-4 focus:ring-primary/20 focus:bg-secondary
-                hover:bg-secondary hover:border-secondary
-                placeholder:text-muted/60
-                outline-none transition-all duration-200
-                ${disabled ? 'opacity-50 cursor-not-allowed' : ''}
-                ${readOnly ? 'cursor-default' : ''}`}
+            className={`input-base ${sizeClasses[size]}`}
         />
     )
 }