desktop: notification page follows the file, saves once, keeps nested keys

From the final review. An edit broke the draft's binding to Notify.config
and Discard assigned a plain value, so a later change to the file read as
unsaved edits; discard and refresh now restore the binding. Save stays
disabled while the write runs, since a second click killed the first
mid-write. Unknown keys inside timeouts and balloons are merged rather
than replaced, as the spec asks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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