🤖 perf: async workspace name generation for faster UX

[ibetitsmike]

Previously, workspace creation blocked for up to 10s while waiting for the AI to generate a workspace name. This caused a poor UX where users had to wait before seeing any result.

Changes

• Use generatePlaceholderName() to create workspace immediately with a temporary name derived from the user's message (e.g., 'add-user-auth')
• Generate AI name asynchronously in the background via generateAndApplyAIName()
• If AI generation succeeds and differs from placeholder, rename workspace using existing rename() method
• If AI generation or rename fails, gracefully keep the placeholder name

UX Improvement

Before	After
User waits 5-10s for AI name generation	Workspace appears instantly
Loading spinner while blocked	AI name applied seamlessly when ready
Network/API errors block creation	Errors handled gracefully, placeholder name retained

The existing generatePlaceholderName() function was already implemented but unused - this change puts it to work.

Generated with mux

[chatgpt-codex-connector]

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[ammario]

Can we reliably rename a workspace with an active stream? Just making sure it won't interfere with running bash operations, file edits, etc.

[ibetitsmike]

@ammario the idea was to wait until stream ends

const handler = (event: StreamEndEvent | StreamAbortEvent) => {
        if (event.workspaceId === workspaceId) {
          this.aiService.off("stream-end", handler);
          this.aiService.off("stream-abort", handler);
          log.debug("Stream completed, proceeding with rename", { workspaceId });
          resolve();
        }
      };