Add scrobbling support (Last.fm + ListenBrainz) and rsp settings reload

- Full Last.fm API implementation with MD5 signing (track.updateNowPlaying, track.scrobble)
- Full ListenBrainz API implementation (/1/submit-listens for playing_now and single)
- ScrobbleState in daemon tracking track, start time, and unix timestamp per play
- Scrobble threshold: ≥30s play AND (≥half duration OR ≥4 min)
- Duration extraction from symphonia codec params into AudioMetadata and Track
- Token validation at daemon startup and on config change
- ListenBrainz token valid (user: Salmonium) command to re-read config from disk (avoids token in shell history)
- Desktop notifications for token validation results
- Empty-credential filtering (empty string = no-op)

1 files changed, 8 insertions, 0 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 7d56de6..f9a3c6f 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -105,6 +105,8 @@ pub enum SettingsCommands {
         #[arg(value_name = "KEY")]
         key: String,
     },
+    /// Reload config from disk (re-reads config file, re-validates scrobbling tokens)
+    Reload,
 }
 
 impl Cli {
@@ -199,6 +201,9 @@ impl Cli {
                     SettingsCommands::Set { key, value } => {
                         config.set(key, value)?;
                         config.save()?;
+                        if key == "listenbrainz_token" {
+                            let _ = crate::daemon::send_command("validate".to_string());
+                        }
                     }
                     SettingsCommands::List => {
                         config.list();
@@ -207,6 +212,9 @@ impl Cli {
                         config.unset(key)?;
                         config.save()?;
                     }
+                    SettingsCommands::Reload => {
+                        let _ = crate::daemon::send_command("reload".to_string());
+                    }
                 }
             }
             Commands::Completions { shell } => {