[LocalMode] Attachment surface for the composer: image/file attach via picker, paste, and drag-and-drop with preview thumbnails, per-item removal, a hovercard preview, media-category auto-detection, and upload-state chips. Produces attachments via a bundled readFileAsDataUrl helper (copy-owned); the shape match
pnpm dlx shadcn@latest add "https://registry.directory/r/localmode-ai/ui/conversation/prompt-input-attachments.json"