feat: add clipboard file handling for Mattermost and implement batch debounce functionality

scripts/iphone-photo-inbox/copy_files_to_clipboard.swift

@@ -0,0 +1,40 @@
+#!/usr/bin/env swift
+
+import AppKit
+import Foundation
+
+let paths = CommandLine.arguments.dropFirst()
+
+guard !paths.isEmpty else {
+    fputs("usage: copy_files_to_clipboard.swift <path> [path...]\n", stderr)
+    exit(64)
+}
+
+let urls = paths.map { URL(fileURLWithPath: $0).standardizedFileURL }
+let missing = urls.filter { !FileManager.default.fileExists(atPath: $0.path) }
+
+guard missing.isEmpty else {
+    for url in missing {
+        fputs("missing file: \(url.path)\n", stderr)
+    }
+    exit(66)
+}
+
+let pasteboard = NSPasteboard.general
+pasteboard.clearContents()
+
+let wroteObjects = pasteboard.writeObjects(urls as [NSURL])
+
+let filenamesType = NSPasteboard.PasteboardType("NSFilenamesPboardType")
+let pathsList = urls.map(\.path)
+let wroteFilenames = pasteboard.setPropertyList(pathsList, forType: filenamesType)
+let wrotePlainText = pasteboard.setString(pathsList.joined(separator: "\n"), forType: .string)
+
+if wroteObjects || wroteFilenames || wrotePlainText {
+    let itemCount = pasteboard.pasteboardItems?.count ?? 0
+    fputs("pasteboard files=\(urls.count) items=\(itemCount) objects=\(wroteObjects) filenames=\(wroteFilenames) text=\(wrotePlainText)\n", stderr)
+    exit(0)
+}
+
+fputs("failed to write file URLs to pasteboard\n", stderr)
+exit(1)