feat: artist/page endpoint, multi-disc fix, playlist ownership, UX improvements

- Switch artist view to artist/page API (proper sections: Albums, Singles & EPs,
  Live, Compilations; version in titles like "Deluxe")
- Fix artist sections categorization using releases[].type from artist/page
- Add getUser() backend call; fetch on session restore when userId=0 to fix
  playlist ownership (Remove from playlist / Delete playlist were missing)
- Fix multi-disc double-click / Play Now queue start index (disc headers were
  counted in row index but excluded from currentTracksJson)
- Hide redundant Album column when viewing an album
- Make artist name in context header clickable (navigates to artist page)
- Fix gap between title and artist name in context header (addStretch)
- Fix queue panel track titles to include version field
- Fix album list to show version in title column

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

rust/src/api/models.rs

@@ -46,6 +46,7 @@ pub struct SubscriptionDto {
 pub struct TrackDto {
     pub id: i64,
     pub title: Option<String>,
+    pub version: Option<String>,
     pub duration: Option<i64>,
     pub track_number: Option<i32>,
     pub playlist_track_id: Option<i64>,
@@ -120,6 +121,10 @@ pub struct ArtistDto {
     pub image: Option<ImageDto>,
     pub biography: Option<BiographyDto>,
     pub albums: Option<SearchResultItems<AlbumDto>>,
+    #[serde(rename = "epSingles")]
+    pub ep_singles: Option<SearchResultItems<AlbumDto>>,
+    #[serde(rename = "liveAlbums")]
+    pub live_albums: Option<SearchResultItems<AlbumDto>>,
 }
 
 #[derive(Debug, Deserialize, Clone, Serialize)]