fix: include music releases in channel feeds

Channel feeds previously queried only the Videos tab, excluding artist release tracks visible in general Search. Flatten Releases albums after uploads while retaining raw-row pagination, deduplication, cancellation, and extractor errors.

src/youtube.rs

@@ -10,6 +10,8 @@ use std::{
 
 use serde::{Deserialize, Serialize};
 
+mod catalog;
+
 pub const PAGE_SIZE: usize = 60;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -387,6 +389,7 @@ const MAX_EXTRACTORS: usize = 4;
 pub struct Job {
     children: Vec<Extraction>,
     queued: VecDeque<Command>,
+    feed: Option<catalog::FeedExpansion>,
 }
 
 struct Extraction {
@@ -486,7 +489,11 @@ impl Job {
     }
 
     pub fn feed(channels: &[String], requests: &[FeedRequest], query: &str) -> io::Result<Self> {
-        Self::spawn_all(feed_commands(channels, requests, query)?)
+        let mut job = Self::spawn_all(feed_commands(channels, requests, query)?)?;
+        if query.is_empty() {
+            job.feed = Some(catalog::FeedExpansion::new(channels, requests));
+        }
+        Ok(job)
     }
 
     pub fn channel(id: &str) -> io::Result<Self> {
@@ -518,6 +525,7 @@ impl Job {
         Ok(Self {
             children: vec![Extraction::spawn(command)?],
             queued: VecDeque::new(),
+            feed: None,
         })
     }
 
@@ -525,6 +533,7 @@ impl Job {
         let mut job = Self {
             children: Vec::new(),
             queued: VecDeque::new(),
+            feed: None,
         };
         // Dropping job also cancels started children if any initial spawn fails.
         for mut command in commands {
@@ -538,6 +547,17 @@ impl Job {
     }
 
     pub fn poll(&mut self) -> Option<Result<String, String>> {
+        if let Some(mut feed) = self.feed.take() {
+            let result = feed.poll(self);
+            if result.is_none() {
+                self.feed = Some(feed);
+            }
+            return result;
+        }
+        self.poll_extractions()
+    }
+
+    fn poll_extractions(&mut self) -> Option<Result<String, String>> {
         if self.children.is_empty() {
             return None;
         }