refactor(view-sync): pearl--save-query-mark-synced preserves unknown plist keys

The prior implementation rebuilt the spec from a fixed key set (:filter, :sort, :order, plus the four :linear-view-* sync keys and the optional :linear-view-url) and silently dropped anything else. No keys outside that set live on a saved-query entry today, but the persistence layer was coupled to the current schema. A future :description, a user-added annotation, or any new pearl field would vanish on every re-sync.

I switched to copy-then-plist-put: shallow-copy the existing spec, plist-put the four sync keys on top, and conditionally plist-put :linear-view-url when this call provided one. Arbitrary keys survive untouched. The URL-preservation behavior on a re-sync that omits view-url is unchanged: the prior :linear-view-url is already in the copied spec, so the when-view-url guard skips the put and leaves it in place.

I added one regression test that seeds an entry with :description and :user-tag alongside the standard keys and asserts all of them survive a mark-synced call. All 661 ert tests pass. make compile and make lint are clean.

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