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/client.rs

@@ -266,6 +266,15 @@ impl QobuzClient {
         Ok(serde_json::from_value(body)?)
     }
 
+    pub async fn get_artist_page(&self, artist_id: i64) -> Result<Value> {
+        let resp = self
+            .get_request("artist/page")
+            .query(&[("artist_id", artist_id.to_string())])
+            .send()
+            .await?;
+        Self::check_response(resp).await
+    }
+
     // --- Search ---
 
     pub async fn search(&self, query: &str, offset: u32, limit: u32) -> Result<SearchCatalogDto> {