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.

context/SessionContext.ts

@@ -1,4 +1,4 @@
-import {SessionProps} from "@/lib/models/Session";
+import {SessionProps} from "@/lib/types/session";
 import {Context, createContext, Dispatch, SetStateAction} from "react";
 
 export interface SessionContextProps {
@@ -12,6 +12,6 @@ export const SessionContext: Context<SessionContextProps> = createContext<Sessio
         accessToken: "",
         user: null,
     },
-    setSession: () => {
+    setSession: (): void => {
     },
 })