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"@jmfederico/pi-web": patch
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Show a per-session sending indicator while messages with image attachments are uploading. Previously the composer cleared instantly while the upload, server-side image resizing, and first-session open happened in the background, so it looked like nothing was happening. The chat activity dock now shows "Sending your message…" for the originating session (including the folder-mode upload step), and that session shows the activity dot in the session list so progress is visible even after switching away. The indicator is scoped per session, so it no longer leaks onto other sessions or machines, and the upload itself continues in the background regardless of navigation.