feat: multi-user identity for workspace chat

[zomux]

Summary

• Identity dialog: When a user opens the workspace, a styled dialog prompts them for their name (cookie-persisted, no re-entry needed). Authenticated users (Google sign-in) skip the dialog entirely.
• Sender metadata on messages: Each message now carries sender_id and sender_name in the event payload. Chat view shows actual names instead of "You" for all human messages.
• Color-coded avatars: Each user gets a deterministic HSL color based on their identity, so users are visually distinguishable.
• Online users sidebar: A new section shows who is currently in the workspace with green presence dots, powered by heartbeat events (15s interval, 45s staleness pruning).
• Backend: POST /v1/events now returns payload in the response for consistency.

Differences from PR #380

This is an independent, cleaner implementation of the same feature:

Aspect	PR #380	This PR
Name entry	window.prompt() (blocking modal)	Styled Radix Dialog
Storage	localStorage	Cookies (1-year, SameSite=Lax)
Language	Chinese-only prompt text	English
Empty name handling	Infinite while loop	Dialog stays open, input disabled
Scope	Bundles Launcher/Kimi/daemon fixes	Identity feature only
Backend changes	Adds sender fields to request model	Passes through payload as-is

Test plan

• Open workspace without being logged in — identity dialog should appear
• Enter name and submit — name persists in cookie, dialog closes
• Send messages — messages show your name, other users' messages show their names
• Open workspace in second browser/incognito — should prompt for name again, show as different user
• Check sidebar — online users section shows who is connected
• Close tab and reopen — name should be remembered from cookie
• Sign in with Google — identity dialog should NOT appear, email/displayName used automatically
• npx tsc --noEmit passes with no errors

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
openagents-workspace	Ready	Preview, Comment	May 25, 2026 6:11am