Desktop: Help icon update red dot should track Desktop updater, not core release notes

[benceruleanlu]

On Desktop (Electron), the help icon red dot currently indicates core (ComfyUI) release notes are newer than backend /system_stats.system.comfyui_version, which incorrectly pegs Desktop UX to core updates.

Current:

• src/components/sidebar/SidebarHelpCenterIcon.vue uses useReleaseStore().shouldShowRedDot for the badge.
• src/platform/updates/common/releaseStore.ts fetches GET https://api.comfy.org/releases?project=comfyui... and compares vs backend comfyui_version.

Expected:

• On Electron, the help icon “update” red dot reflects Desktop app update availability (todestkop autoUpdater rail), not core release notes.
• Automatic background checking for the dot should be gated by Comfy-Desktop.AutoUpdate.
• Conflict red dot behavior remains unchanged.

Notes:

• Desktop updater APIs exist: electronAPI.checkForUpdates() / electronAPI.restartAndInstall() (see src/extensions/core/electronAdapter.ts).

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