chore(release): bump snapcraft and flake to 1.2.14

snapcraft.yaml: version: '1.2.14' AND source-tag: v1.2.14 (both fields —
updating only one leaves the Snap Store building the previous tag).
packaging/snap/snapcraft.yaml is a symlink to it, so both stay in sync
automatically.

flake.nix: qbzVersion -> 1.2.14; srcHash/npmHash cleared, to be refilled
via `nix build` after the v1.2.14 tag exists, in a follow-up commit as in
prior releases.

cc

flake.nix

@@ -15,10 +15,10 @@
         # VERSION BUMP: update version, rev, and hashes
         # when tagging a new release.
         # ──────────────────────────────────────────────
-        qbzVersion = "1.2.13";
+        qbzVersion = "1.2.14";
         qbzRev     = "v${qbzVersion}";
-        srcHash    = "sha256-LlpMCO8RHbC+MNCcsaUqAGNuaK2CSk4GEpVtmfKtsFo=";
+        srcHash    = "";
-        npmHash    = "sha256-HfdYKnjXf6/LqdTy7RCPfVfh8NdXuGHYrqDWAT3ozk4=";
+        npmHash    = "";
       in
       {
         packages.default = pkgs.rustPlatform.buildRustPackage rec {

snapcraft.yaml

@@ -3,7 +3,7 @@
 
 name: qbz-player
 title: "QBZ — Native Qobuz Client for Linux"
-version: '1.2.13'
+version: '1.2.14'
 summary: Native Qobuz player for Linux with bit-perfect audio and DAC control
 description: |
   QBZ is a native Linux desktop client for Qobuz™, designed for high-fidelity playback.
@@ -97,7 +97,7 @@ parts:
   qbz:
     plugin: rust
     source: https://github.com/vicrodh/qbz.git
-    source-tag: v1.2.13
+    source-tag: v1.2.14
     build-packages:
       - libwebkit2gtk-4.1-dev
       - libgtk-3-dev