style(tauri): drop redundant use super::*; imports

Five lib_commands submodules either had `use super::*;` duplicated
during the split (core.rs, offline.rs, mini.rs — leftover line 3) or
didn't reference the parent scope at all (navidrome.rs, bandsintown.rs).
Removing them silences all five `unused import` warnings; cargo check
is now warning-free.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src-tauri/src/lib_commands/app_api/core.rs

@@ -1,7 +1,5 @@
 use super::*;
 
-use super::*;
-
 #[tauri::command]
 pub(crate) fn greet(name: &str) -> String {
     format!("Hello, {}!", name)

src-tauri/src/lib_commands/app_api/navidrome.rs

@@ -1,5 +1,3 @@
-use super::*;
-
 /// Authenticate with Navidrome's own REST API and return a Bearer token.
 pub(crate) async fn navidrome_token(server_url: &str, username: &str, password: &str) -> Result<String, String> {
     let client = reqwest::Client::new();