Desktop app hangs indefinitely on every request (Marinating/Concocting/Imagining...)

Description

Every message sent in the desktop app results in an infinite loading spinner (cycling through messages like "Marinating...", "Concocting...", "Imagining...") with no response ever returned.

Environment

• OS: macOS (Darwin 25.3.0)
• Desktop app version: 2.1.76
• CLI version: 2.1.76 (native install)

Steps to Reproduce

1. Open the desktop app
2. Start a new session
3. Send any message (e.g. "Hi are you working")
4. Loading indicator appears and spins indefinitely — no response

What I Tried

• Force quit and relaunched the app
• Cleared ~/Library/Application Support/Claude completely
• Removed duplicate npm global installation (npm -g uninstall @anthropic-ai/claude-code)
• Tried multiple new sessions

What Works

• CLI (claude) works perfectly
• API connectivity confirmed: curl https://api.anthropic.com/v1/messages returns 401 as expected

Expected Behavior

The app should respond to messages within a few seconds.

Actual Behavior

Infinite spinner, no response ever returned.