Fix build: annotate list-VM merge locals so .sorted infers its element

The generation-guard refactor moved the fetched.map{…}.sorted{…} chain into an
untyped `let merged`, dropping the type anchor the property assignment used to
provide. A multi-statement .map closure then leaves .sorted's $0 uninferred
(error: cannot infer type of closure parameter). Annotate merged in
OLTListViewModel and ONUListViewModel as [OLTStateDoc]/[ONUStateDoc].

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

OLTListViewModel.swift

@@ -29,7 +29,7 @@ final class OLTListViewModel {
         do {
             let fetched = try await connection.olt.allStates()
             let names = (try? await connection.olt.nameMap()) ?? [:]
-            let merged = fetched
+            let merged: [OLTStateDoc] = fetched
                 .map { olt in var olt = olt; olt.resolvedName = names[olt.id]; return olt }
                 .sorted { $0.displayName.localizedCaseInsensitiveCompare($1.displayName) == .orderedAscending }
             guard gen == loadGeneration, !Task.isCancelled else { return }