🤖 perf: exit splash screen immediately after workspace.create()

[ammar-agent]

Switch to the workspace view as soon as workspace.create() succeeds, rather than waiting for sendMessage() to complete.

What changed

Before:

setIsSending(true)
await waitForGeneration()
await workspace.create(...)
await workspace.sendMessage(...)  ← blocked here
onWorkspaceCreated(metadata)
setIsSending(false)               ← splash exits

After:

setIsSending(true)
await waitForGeneration()
await workspace.create(...)
onWorkspaceCreated(metadata)      ← switch immediately
setIsSending(false)               ← splash exits
void workspace.sendMessage(...)   ← fire-and-forget

Why this is safe

1. Stream errors handled by workspace UI: Once switched to the workspace view, the chat UI listens to stream-error events and displays them inline
2. sendMessage returns quickly: The RPC just kicks off the stream in the background via processStreamWithCleanup() and returns
3. No race conditions: Preferences are synced before switching, and the workspace store is updated atomically

This reduces perceived latency by eliminating the sendMessage RPC round-trip from the splash screen duration.

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Generated with mux • Model: anthropic:claude-opus-4-5 • Thinking: high

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