Give mixed selections something to do

A Drag of different kinds showed an empty wheel, because the catalog only
answers for a single category. Filee's answer is a mixed profile, so add
Zip (one archive, flat names) and Merge (non-PDFs are converted to PDF
first); a multi-file drag of one kind gets Zip too.

Sources/Konverter/Convert/ToolRunner.swift

@@ -207,7 +207,37 @@ enum ToolRunner {
                 for: first.deletingLastPathComponent()
                     .appendingPathComponent(first.deletingPathExtension().lastPathComponent + " merged.pdf")
             )
-            try PDFConverter.merge(inputs, at: destination, cancellation: cancellation)
+            // A mixed selection is merged by turning each non-PDF into a PDF
+            // first, so "3 photos + 2 PDFs" is one drop instead of two jobs.
+            var staged: [URL] = []
+            let staging = FileManager.default.temporaryDirectory
+                .appendingPathComponent("konverter-merge-\(UUID().uuidString)", isDirectory: true)
+            defer { if !staged.isEmpty { try? FileManager.default.removeItem(at: staging) } }
+
+            var sources: [URL] = []
+            for (index, input) in inputs.enumerated() {
+                try cancellation?.check()
+                if FileKind.category(of: input) == .pdf {
+                    sources.append(input)
+                    continue
+                }
+                if staged.isEmpty {
+                    try FileManager.default.createDirectory(at: staging, withIntermediateDirectories: true)
+                }
+                let name = String(format: "%03d", index) + "-"
+                    + input.deletingPathExtension().lastPathComponent + ".pdf"
+                let temp = staging.appendingPathComponent(name)
+                try Converter.convert(
+                    source: input,
+                    to: .pdf,
+                    at: temp,
+                    cancellation: cancellation,
+                    progress: { fraction in progress?(fraction * 0.5) }
+                )
+                staged.append(temp)
+                sources.append(temp)
+            }
+            try PDFConverter.merge(sources, at: destination, cancellation: cancellation)
             progress?(1)
             return ToolOutcome(outputs: [destination])
 
@@ -377,6 +407,21 @@ enum ToolRunner {
                 results.append(MediaInfo.describe(source))
             }
             return ToolOutcome(message: results.joined(separator: "\n\n"), messageTitle: "Info")
+
+        case .createArchive:
+            let folder = inputs[0].deletingLastPathComponent()
+            let name = params.string("name", default: "Archive")
+            let base = name.hasSuffix(".zip") ? String(name.dropLast(4)) : name
+            let destination = OutputNaming.availableURL(
+                for: folder.appendingPathComponent(base).appendingPathExtension("zip")
+            )
+            try ArchiveConverter.createArchive(
+                from: inputs,
+                at: destination,
+                cancellation: cancellation,
+                progress: progress
+            )
+            return ToolOutcome(outputs: [destination])
         }
     }