Fix remaining manual-plural i18n anti-patterns app-wide

Three pre-existing spots used count == 1 ? "" : "s" instead of the
inflect syntax CLAUDE.md documents: GitSyncManualFixSheet's step()
helper (also switched String -> LocalizedStringKey, another documented
anti-pattern), PaperlessService.testConnection(), and
AnytypeMCPService.testConnection().

oAI/Services/AnytypeMCPService.swift

@@ -44,7 +44,7 @@ class AnytypeMCPService {
             let result = try await request(endpoint: "/v1/spaces", method: "GET", body: nil)
             if let spaces = result["data"] as? [[String: Any]] {
                 isConnected = true
-                return .success("Connected (\(spaces.count) space\(spaces.count == 1 ? "" : "s"))")
+                return .success(String(localized: "Connected (^[\(spaces.count) space](inflect: true))"))
             } else {
                 isConnected = true
                 return .success("Connected to Anytype")