Clarify per-conversation attachments in the composer

[benjaminshafii]

Summary

• add a clearer drag-and-drop target so files feel attached to the current conversation, not the shared folder
• label pending uploads as conversation-scoped before send
• make the paperclip affordance explicit about attaching files to the chat

Testing

• pnpm --filter @openwork/app typecheck
• pnpm --filter @openwork/app build
• Not run: Docker + Chrome MCP end-to-end verification for this branch

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openwork-app	Ready	Preview, Comment	Mar 21, 2026 4:54pm
openwork-den	Building	Preview	Mar 21, 2026 4:54pm
openwork-den-worker-proxy	Ready	Preview, Comment	Mar 21, 2026 4:54pm
openwork-landing	Ready	Preview, Comment, Open in v0	Mar 21, 2026 4:54pm
openwork-share	Ready	Preview, Comment	Mar 21, 2026 4:54pm

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

[benjaminshafii]

Chrome MCP verification pass completed on localhost:5173.

Verified:

• the composer labels attachments as conversation-scoped before send
• the paperclip affordance now reads Attach files to this conversation
• attaching an image shows the pending attachment chip above the composer

Screenshot:

• https://files.catbox.moe/3fl0mb.png