[BUG] Desktop app panics on window creation failure in headless environments

Problem

The desktop app will crash with a panic when window creation fails:

File: apps/desktop/src/main.rs:50

cx.open_window(
    WindowOptions { ... },
    |_, cx| { ... }
)
.expect("failed to open the main window");

Scenarios Where It Breaks

• Running in CI/headless environment (no display server)
• SSH session without X forwarding
• Display server unavailable (Wayland/X11 connection fails)
• GPU initialization errors
• System resource exhaustion

Root Cause

Using .expect() on a Result causes panic on Err instead of graceful error handling.

Expected Behavior

Application should:

• Return proper error instead of panicking
• Provide fallback mode for headless execution
• Display user-friendly error message

Recommended Fix

Replace .expect() with proper error handling:

cx.open_window(...)?

Or with explicit error handling:

cx.open_window(...).map_err(|e| {
    eprintln!("Failed to open window: {}", e);
    e
})?

Detection Method: Static code analysis
Severity: Critical (blocks headless/CI usage)

Start at apps/desktop/src/main.rs:50 and inspect the open_window call and its surrounding return type. Verify how errors are handled by nearby startup code, then replace the panic path with propagated or explicitly reported failure; done means window creation no longer panics in a headless environment and the error is user-visible.