Describe the bug
See title: Building the app with the 'notify' feature set also requires the 'streaming' feature to be set, otherwise it won't compile.

To Reproduce
Build the app with: cargo build --release --bin spotify_player --no-default-features --features notify

Expected behaviour
It should be possible to compile 'notify' on its own (or make it dependent on 'streaming').

The problem lies in the if statement in spotify_player/src/client/mod.rs:1464 : It gets enabled ONLY by the 'notify' feature flag but in ln1465 two fields are accessed which are only present when BOTH 'notify' and 'streaming' flags are set (see spotify_player/src/client/mod.rs:36 and spotify_player/src/config/mod.rs:109). Thus it won't compile.

As I'm not familiar with the project I'm not sure if it is fixed by simply changing client/mod.rs:ln1463 from #[cfg(feature = "notify")] to #[cfg(all(feature = "streaming", feature = "notify"))] so that these fields are only accessed when we are sure that they are present. But I suspect this would somewhat break the notify feature (if compiled on its own).

Log and backtrace
Compiler error:

error[E0609]: no field `notify_streaming_only` on type `AppConfig`
    --> spotify_player/src/client/mod.rs:1465:37
     |
1465 |             && (!configs.app_config.notify_streaming_only || self.stream_conn.lock().is_some())
     |                                     ^^^^^^^^^^^^^^^^^^^^^ unknown field
     |
     = note: available fields are: `theme`, `client_id`, `client_id_command`, `client_port`, `player_event_hook_command` ... and 20 others

error[E0609]: no field `stream_conn` on type `&client::Client`
    --> spotify_player/src/client/mod.rs:1465:67
     |
1465 |             && (!configs.app_config.notify_streaming_only || self.stream_conn.lock().is_some())
     |                                                                   ^^^^^^^^^^^ unknown field
     |
     = note: available fields are: `http`, `spotify`, `auth_config`
     = note: available field is: `session`

For more information about this error, try `rustc --explain E0609`.
error: could not compile `spotify_player` (bin "spotify_player") due to 2 previous errors

Screenshots

Environment

• OS: Opensuse Tumbleweed
• Application version: cargo 1.81.0, spotify-player (latest master)
• Application features: any feature combination with 'notify' and without 'streaming'

Additional context
Maybe a good first issue? I'd like to fix it / open a PR by myself but I'm quite unfamiliar with this project (and with rust).