feat(messaging-ui): Gmail-style uploading chip while an attachment uploads (0.1.2)

Picking a file now shows an immediate chip with the filename + a spinner while
the bytes upload (mail compose, mail reply, and the messenger composer), instead
of only appearing once upload finishes. Respects prefers-reduced-motion.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/iios-messaging-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@insignia/iios-messaging-ui",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "type": "module",
   "main": "dist/index.js",
   "module": "dist/index.js",