feat(discover): add Release Watch section to Home and For You

The Qobuz mobile client (v9.7) surfaces a 'Release Watch' /
'Radar de Novedades' feed in its Discover screens — new releases
from the artists, labels and award series the user follows. We
didn't have parity for it. This adds it as a module in both
Discover tabs.

Backend:
- qbz-qobuz: new ALBUMS_RELEASE_WATCH endpoint constant
  (/albums/releaseWatch, plural as in mobile) and signed_get_auth
  client method returning a SearchResultsPage<Album>. Signing
  method is 'albumsreleaseWatch' per the Qobuz secret protocol.
- qbz-core: passthrough get_release_watch on QbzCore.
- src-tauri: core_bridge wrapper, new v2_get_release_watch Tauri
  command registered in lib.rs. Filters through the artist
  blacklist like other album endpoints.

Frontend:
- HomeView: new renderable section 'releaseWatch' in the home tab
  (default visible, placed right after New Releases). Parallel
  fetch alongside the existing discover_index call; mapped via
  the existing toAlbumCard helper.
- ForYouTab: section appears ahead of 'Essentials' since followed
  artists/labels are typically more personal.
- homeSettingsStore: new HomeSectionId 'releaseWatch' in the type
  union and DEFAULT_SECTIONS so the user can toggle/reorder it
  from home customization.
- i18n: discover.releaseWatch.title + subtitle added to all five
  locales, using Qobuz's own translations where they exist
  ('Radar de Novedades' for Spanish, 'Release-Radar' for German)
  with the 'followed artists/labels/awards' subtitle copy adapted
  from the mobile app's strings.xml resources.

cc

crates/qbz-core/src/core.rs

@@ -760,6 +760,22 @@ impl<A: FrontendAdapter + Send + Sync + 'static> QbzCore<A> {
             .map_err(CoreError::Api)
     }
 
+    /// Get Release Watch — new releases from followed artists, labels and
+    /// awards (the "Radar de Novedades" feed in the Qobuz mobile client).
+    pub async fn get_release_watch(
+        &self,
+        limit: u32,
+        offset: u32,
+    ) -> Result<SearchResultsPage<Album>, CoreError> {
+        let client = self.client.read().await;
+        let client = client.as_ref().ok_or(CoreError::NotInitialized)?;
+
+        client
+            .get_release_watch(limit, offset)
+            .await
+            .map_err(CoreError::Api)
+    }
+
     /// Get artist page (full artist details with albums, tracks, similar)
     pub async fn get_artist_page(
         &self,