fix: update EPG item description and refactor component

Ref the EPG item to directly display the category 
and description values instead of accessing the first element of 
the arrays. Update the EpgListComponent to improve the handling 
of EPG data and selected date filtering. Change references from 
Electron to Tauri in the component to reflect the 
current framework usage.

src/app/app.component.ts

@@ -12,8 +12,6 @@ import * as semver from 'semver';
 import { IpcCommand } from '../../shared/ipc-command.class';
 import {
     AUTO_UPDATE_PLAYLISTS,
-    EPG_ERROR,
-    EPG_FETCH_DONE,
     ERROR,
     OPEN_FILE,
     SETTINGS_UPDATE,
@@ -50,8 +48,6 @@ export class AppComponent {
     commandsList = [
         new IpcCommand(VIEW_ADD_PLAYLIST, () => this.navigateToRoute('/')),
         new IpcCommand(VIEW_SETTINGS, () => this.navigateToRoute('/settings')),
-        new IpcCommand(EPG_FETCH_DONE, () => this.epgService.onEpgFetchDone()),
-        new IpcCommand(EPG_ERROR, () => this.epgService.onEpgError()),
         new IpcCommand(SHOW_WHATS_NEW, () => this.showWhatsNewDialog()),
         new IpcCommand(ERROR, (response: { message: string; status: number }) =>
             this.showErrorAsNotification(response)