Feat/upload state

[JAYATIAHUJA]

Description

Adds UploadState, an accessible file drop area with native file selection, controlled upload states, and optional progress.

Changes

• added the UploadState registry component
• added an interactive docs demo with simulated progress and error states
• added docs, navigation, and generated registry files

Motivation

Gives apps a reusable file selection UI without tying them to a specific upload service or validation flow.

Breaking Changes

None.

Screenshots

Not included. This adds a new component, so there is no before state.

Checklist

• pnpm check passes locally
• pnpm build passes locally (the build timed out locally without an error)
• pnpm build:registry was run and the generated files are committed
• PR title follows Conventional Commits

[vercel]

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[Yeom-JinHo]

@JAYATIAHUJA Thanks for the work here — this is a scope call, not a quality one

Magic UI's catalog is visual-effects-first and has no form controls today. This is a standard dashed-border dropzone with no visual hook, which puts it closer to shadcn/ui's territory, so I'm going to close it.