build(desktop): pin electron-builder to 26.14.0 (snap fix + Wayland)

electron-builder 26.15.0 replaced the Go app-builder-bin snap builder with
a pure-TS rewrite (#9829) that ships a broken snap: the launcher references
$SNAP/desktop-init.sh that is never staged, and even past that the bundled
NSS/NSPR libs are unreachable (libnspr4.so: cannot open shared object file)
because SNAP_DESKTOP_RUNTIME / LD_LIBRARY_PATH are not wired up. 26.15.1-.3
all carry the regression.

The snap Wayland fix that motivated moving off 26.0.12 (#9337/#9320) shipped
in 26.2.0 — well before the 26.15.0 rewrite. Pinning to 26.14.0 keeps that
fix (DISABLE_WAYLAND / allowNativeWayland handling) and the proven Go-based
snap builder, which correctly sets SNAP_DESKTOP_RUNTIME and LD_LIBRARY_PATH.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: valkirilov

package.json

@@ -174,7 +174,7 @@
     "deep-object-diff": "^1.1.9",
     "dotenv": "^16.4.5",
     "electron": "^40.10.2",
-    "electron-builder": "^26.15.2",
+    "electron-builder": "26.14.0",
     "electron-builder-notarize": "^1.5.2",
     "electron-debug": "^3.2.0",
     "electron-devtools-installer": "^3.2.0",