Some UI “Update” actions currently direct users to git/source update docs, which is incorrect for Desktop (todestkop updater).

Current:

• src/platform/updates/components/ReleaseNotificationToast.vue Update button opens docs /installation/update_comfyui.
• Desktop update flow already exists in src/extensions/core/electronAdapter.ts via electronAPI.checkForUpdates() + confirm + electronAPI.restartAndInstall().

Expected:

• On Electron, any “Update” action intended to update the Desktop app should invoke the Desktop updater flow (or a Desktop download link), not git-install docs.

Scope (initial):

• Fix the toast Update button first (if toast remains).

Acceptance:

• Clicking “Update” on Desktop triggers checkForUpdates and, when available, restartAndInstall, otherwise shows “no update found”.

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