chore: bump version to 1.2.1

Update all version endpoints, regenerate lockfiles,
add metainfo release entry and release docs.

cc

packaging/flatpak/com.blitzfc.qbz.metainfo.xml

@@ -53,6 +53,11 @@
     </screenshot>
   </screenshots>
   <releases>
+    <release version="1.2.1" date="2026-03-25">
+      <description>
+        <p>Resilience: exponential backoff retry (1s/2s/4s) with quality fallback when Qobuz servers return 504s. User preference modal for retry behavior (ask/always fallback/always skip), persisted in settings. Degraded service indicator with 5-minute auto-clear. Manual network check button. macOS port foundation (gated backends, native title bar, CI workflow). Offline mode improvements (last known profile restore, dismissible banner, network folders). WebKitGTK 2.50+ image flicker fix. Hybrid Intel+NVIDIA compositing fix. QConnect fixes for queue_version tolerance and ALSA volume control. i18n: hardcoded strings replaced in SearchView and PlaylistDetailView. Security: aws-lc-sys 0.39.0, rustls-webpki 0.103.10.</p>
+      </description>
+    </release>
     <release version="1.2.0" date="2026-03-19">
       <description>
         <p>Qobuz Connect: multi-device playback with renderer and controller mode, server-authoritative queue sync, and bidirectional transport controls. Linebed 3D terrain visualizer with 4096-point FFT. Qobuz playlist follow/unfollow with native API sync. Audio settings sync overhaul fixing exclusive mode with QConnect. Volume lock for ALSA Direct hw:. HiFi Wizard real DAC sample rate detection. MuPDF 0.6 restoring booklet viewer. Offline mode button on network error screen. KWin SSD hack removed. PipeWire rate switch verification with retry. Help tooltips on bit-perfect settings. 185 commits.</p>