Refactor: Remove background task management and related hooks

- Deleted `useBackgroundTasks.ts` hook and its associated logic for managing background tasks.
- Removed `backgroundTaskManager.ts` service and all related task definitions and registrations.
- Cleaned up `Podfile.lock` and `package.json` to remove unused dependencies related to background tasks.
- Updated iOS project files to eliminate references to removed background task components.
- Added new background fetch identifier in `Info.plist` for future use.

android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -1,6 +0,0 @@
-<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-  <item android:drawable="@color/splashscreen_background"/>
-  <item>
-    <bitmap android:gravity="center" android:src="@drawable/splashscreen_logo"/>
-  </item>
-</layer-list>

android/app/src/main/res/drawable/rn_edit_text_material.xml

@@ -1,37 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2014 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<inset xmlns:android="http://schemas.android.com/apk/res/android"
-       android:insetLeft="@dimen/abc_edit_text_inset_horizontal_material"
-       android:insetRight="@dimen/abc_edit_text_inset_horizontal_material"
-       android:insetTop="@dimen/abc_edit_text_inset_top_material"
-       android:insetBottom="@dimen/abc_edit_text_inset_bottom_material"
-       >
-
-    <selector>
-        <!--
-          This file is a copy of abc_edit_text_material (https://bit.ly/3k8fX7I).
-          The item below with state_pressed="false" and state_focused="false" causes a NullPointerException.
-          NullPointerException:tempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable(android.content.res.Resources)'
-
-          <item android:state_pressed="false" android:state_focused="false" android:drawable="@drawable/abc_textfield_default_mtrl_alpha"/>
-
-          For more info, see https://bit.ly/3CdLStv (react-native/pull/29452) and https://bit.ly/3nxOMoR.
-        -->
-        <item android:state_enabled="false" android:drawable="@drawable/abc_textfield_default_mtrl_alpha"/>
-        <item android:drawable="@drawable/abc_textfield_activated_mtrl_alpha"/>
-    </selector>
-
-</inset>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/iconBackground"/>
-    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-</adaptive-icon>

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@color/iconBackground"/>
-    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-</adaptive-icon>

android/app/src/main/res/values-night/colors.xml

@@ -1 +0,0 @@
-<resources/>

android/app/src/main/res/values/colors.xml

@@ -1,6 +0,0 @@
-<resources>
-  <color name="splashscreen_background">#ffffff</color>
-  <color name="iconBackground">#ffffff</color>
-  <color name="colorPrimary">#023c69</color>
-  <color name="colorPrimaryDark">#ffffff</color>
-</resources>

android/app/src/main/res/values/strings.xml

@@ -1,6 +0,0 @@
-<resources>
-  <string name="app_name">digital-pilates</string>
-  <string name="expo_system_ui_user_interface_style" translatable="false">automatic</string>
-  <string name="expo_splash_screen_resize_mode" translatable="false">contain</string>
-  <string name="expo_splash_screen_status_bar_translucent" translatable="false">false</string>
-</resources>

android/app/src/main/res/values/styles.xml

@@ -1,13 +0,0 @@
-<resources xmlns:tools="http://schemas.android.com/tools">
-  <style name="AppTheme" parent="Theme.EdgeToEdge">
-    <item name="android:editTextBackground">@drawable/rn_edit_text_material</item>
-    <item name="colorPrimary">@color/colorPrimary</item>
-    <item name="android:statusBarColor">#ffffff</item>
-    <item name="android:forceDarkAllowed">false</item>
-  </style>
-  <style name="Theme.App.SplashScreen" parent="Theme.SplashScreen">
-    <item name="windowSplashScreenBackground">@color/splashscreen_background</item>
-    <item name="windowSplashScreenAnimatedIcon">@drawable/splashscreen_logo</item>
-    <item name="postSplashScreenTheme">@style/AppTheme</item>
-  </style>
-</resources>