fix: Filter out error code 0xDD from error display

- Exclude machine error code 0xDD (221 decimal) from error popover
- This error code is non-critical and should not be displayed to users
- Maintains all other error codes and messages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/AppHeader.tsx

@@ -182,7 +182,9 @@ export function AppHeader() {
                 {/* Error popover content */}
                 {(machineErrorMessage || pyodideError) && (
                   <ErrorPopoverContent
-                    machineError={machineError}
+                    machineError={
+                      machineError != 0xdd ? machineError : undefined
+                    }
                     isPairingError={isPairingError}
                     errorMessage={machineErrorMessage}
                     pyodideError={pyodideError}