Desktop: Silence/disable core-driven ReleaseNotificationToast on Electron

[benceruleanlu]

On Desktop (Electron), ReleaseNotificationToast shows an “Update Available” toast based on core (ComfyUI) release notes, which is misleading because Desktop updates are on a separate rail.

Current:

• src/components/sidebar/SidebarHelpCenterIcon.vue mounts src/platform/updates/components/ReleaseNotificationToast.vue.
• Visibility is driven by useReleaseStore().shouldShowToast in src/platform/updates/common/releaseStore.ts (Electron-gated) and core release notes (project=comfyui).

Expected:

• Do not show this core-driven toast on Desktop (either remove it for Electron, or decouple it from core release notes entirely).
• Desktop update notifications should come from the Desktop updater flow instead.

Acceptance:

• Core ComfyUI releases do not trigger a Desktop toast/red-dot by themselves.

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