Fix OAuth token refresh and persistence issues

- Add show_dialog=true to OAuth URL to ensure fresh refresh tokens
- Prevent token clearing when refresh fails to avoid total auth loss
- Add ConfigManager to SpotifyClient for token persistence
- Fix token handling flow to maintain authentication state

This resolves the issue where tokens worked once then failed permanently
due to missing refresh tokens and aggressive token clearing on errors.

src/auth.rs

@@ -31,7 +31,8 @@ impl SpotifyAuth {
             .append_pair("response_type", "code")
             .append_pair("client_id", &self.config.client_id)
             .append_pair("scope", &self.config.scopes.join(" "))
-            .append_pair("redirect_uri", &self.config.redirect_uri);
+            .append_pair("redirect_uri", &self.config.redirect_uri)
+            .append_pair("show_dialog", "true");
         
         if let Some(state) = state {
             url.query_pairs_mut().append_pair("state", state);

src/client.rs

@@ -1,4 +1,5 @@
 use crate::auth::SpotifyAuth;
+use crate::config::ConfigManager;
 use crate::error::{Result, SpotifyError};
 use crate::models::{CurrentTrack, SimplifiedCurrentTrack, SpotifyConfig, TokenInfo};
 use chrono::Utc;
@@ -12,10 +13,11 @@ pub struct SpotifyClient {
     client: Client,
     auth: SpotifyAuth,
     token_info: Arc<RwLock<Option<TokenInfo>>>,
+    config_manager: ConfigManager,
 }
 
 impl SpotifyClient {
-    pub fn new(config: SpotifyConfig) -> Self {
+    pub fn new(config: SpotifyConfig, config_manager: ConfigManager) -> Self {
         let client = Client::builder()
             .user_agent("SpotifyTracker/1.0")
             .timeout(std::time::Duration::from_secs(30))
@@ -29,6 +31,7 @@ impl SpotifyClient {
             client,
             auth,
             token_info,
+            config_manager,
         }
     }
 
@@ -140,9 +143,9 @@ impl SpotifyClient {
         let token_guard = self.token_info.read().await;
         
         if let Some(token_info) = token_guard.as_ref() {
-            // Check if token expires in the next 5 minutes
-            let expires_soon = token_info.expires_at - chrono::Duration::minutes(5);
-            Utc::now() < expires_soon
+            // Check if token expires in the next 5 minutes - refresh if within 5 min of expiry
+            let expires_with_buffer = token_info.expires_at - chrono::Duration::minutes(5);
+            Utc::now() < expires_with_buffer
         } else {
             false
         }
@@ -170,13 +173,18 @@ impl SpotifyClient {
                 log::info!("Refreshing expired token...");
                 match self.auth.refresh_token(refresh_token).await {
                     Ok(new_token) => {
+                        // Save token to disk
+                        if let Err(e) = self.config_manager.save_token(&new_token) {
+                            log::error!("Failed to save refreshed token to disk: {}", e);
+                        }
                         *token_guard = Some(new_token);
                         log::info!("Token refreshed successfully");
                         return Ok(());
                     }
                     Err(e) => {
                         log::error!("Failed to refresh token: {}", e);
-                        *token_guard = None;
+                        // Keep the existing token rather than clearing it entirely
+                        // This allows manual re-auth instead of losing the token completely
                         return Err(e);
                     }
                 }
@@ -207,7 +215,8 @@ mod tests {
     #[tokio::test]
     async fn test_client_creation() {
         let config = SpotifyConfig::default();
-        let client = SpotifyClient::new(config);
+        let config_manager = ConfigManager::new().unwrap();
+        let client = SpotifyClient::new(config, config_manager);
         
         assert!(!client.is_token_valid().await);
     }
@@ -215,7 +224,8 @@ mod tests {
     #[test]
     fn test_authorization_url() {
         let config = SpotifyConfig::default();
-        let client = SpotifyClient::new(config);
+        let config_manager = ConfigManager::new().unwrap();
+        let client = SpotifyClient::new(config, config_manager);
         
         let url = client.get_authorization_url(Some("test_state"));
         assert!(url.contains("spotify.com"));