feat: spicetify support for flatpak spotify install (#1097)

# Pull Request

## Description

This PR does several things:
1. `spicetify` now can handle spotify installed via flatpak
2. Spotify theme download URL changed from `prasanthrangan/hyprdots` to
`HyDE-Project/HyDE` repo
3. Spotify theme is not downloaded if already present in the system
4. `Sleek` theme updated with latest files from
[here](https://github.com/spicetify/spicetify-themes/tree/master/Sleek)

## Type of change

- [ ] **Bug fix** (non-breaking change which fixes an issue)
- [x] **New feature** (non-breaking change which adds functionality)
- [ ] **Breaking change** (fix or feature that would cause existing
functionality to not work as expected)
- [ ] **Documentation update** (non-breaking change; modified files are
limited to the documentations)
- [ ] **Technical debt** (a code change that does not fix a bug or add a
feature but makes something clearer for devs)
- [ ] **Other** (provide details below)

## Checklist

- [x] I have read the
[CONTRIBUTING](https://github.com/HyDE-Project/HyDE/blob/master/CONTRIBUTING.md)
document.
- [x] My code follows the code style of this project.
- [x] My commit message follows the [commit
guidelines](https://github.com/HyDE-Project/HyDE/blob/master/COMMIT_MESSAGE_GUIDELINES.md).
- [ ] My change requires a change to the documentation.
- [ ] I have updated the documentation accordingly.
- [ ] I have added a changelog entry.
- [ ] I have added necessary comments/documentation to my code.
- [ ] I have added tests to cover my changes.
- [x] I have tested my code locally and it works as expected.
- [ ] All new and existing tests passed.

## Screenshots

```sh
❯ flatpak list --app | grep spotify
Spotify	com.spotify.Client	1.2.63.394.g126b0d89	stable	system
```

<img width="945" height="1022" alt="image"
src="https://github.com/user-attachments/assets/94a085ac-aace-406f-8939-300a20335a13"
/>

Author: kRHYME7

Configs/.config/hyde/wallbash/scripts/spotify.sh

@@ -31,11 +31,15 @@ configure_spicetify() {
            -e "/^spotify_path/ s+=.*$+= $spotify_path+g" \
            -e "/^spotify_launch_flags/ s+=.*$+= $spotify_flags+g" "$spotify_conf"
 
-    curl -L -o "${cache_dir}/landing/Spotify_Sleek.tar.gz" "https://github.com/prasanthrangan/hyprdots/raw/main/Source/arcs/Spotify_Sleek.tar.gz"
-    tar -xzf "${cache_dir}/landing/Spotify_Sleek.tar.gz" -C ~/.config/spicetify/Themes/
+    spicetify_themes_dir="$HOME/.config/spicetify/Themes"
+    if [ ! -d "${spicetify_themes_dir}/Sleek" ]; then
+        curl -L -o "${cache_dir}/landing/Spotify_Sleek.tar.gz" "https://github.com/HyDE-Project/HyDE/raw/master/Source/arcs/Spotify_Sleek.tar.gz"
+        tar -xzf "${cache_dir}/landing/Spotify_Sleek.tar.gz" -C "$spicetify_themes_dir"
+    fi
     spicetify backup apply
     spicetify config current_theme Sleek
     spicetify config color_scheme Wallbash
+    spicetify config sidebar_config 0
     spicetify restore backup
     spicetify backup apply
 }
@@ -59,9 +63,11 @@ EOF
         spotify_path="${shareDir}/spotify-launcher/install/usr/bin/spotify"
     elif [ -d /opt/spotify ]; then
         spotify_path='/opt/spotify'
-        if [ ! -w "${spotify_path}" ] || [ ! -w "${spotify_path}/Apps" ]; then
-            notify_and_set_permissions "${spotify_path}"
-        fi
+    elif [ -d /var/lib/flatpak/app/com.spotify.Client/x86_64/stable/active/files/extra/share/spotify ]; then
+        spotify_path='/var/lib/flatpak/app/com.spotify.Client/x86_64/stable/active/files/extra/share/spotify'
+    fi
+    if [ ! -w "${spotify_path}" ] || [ ! -w "${spotify_path}/Apps" ]; then
+        notify_and_set_permissions "${spotify_path}"
     fi
 
 if (pkg_installed spotify && pkg_installed spicetify-cli) || [ -n "$spotify_path" ]; then