bug(base): mobile Firefox shows 'no input file specified' after login

[ralflang]

Summary

When opening the Horde 6 web interface with Firefox on Android (mobile), login succeeds but then a message appears in very small text: "no input file specified." No further interaction is possible. The same result occurs when selecting mobile mode on a desktop browser.

Suspected Cause

Likely a rewrite rule or routing issue specific to the mobile/SmartMobile portal path. The "no input file specified" message typically comes from the web server (nginx/PHP-FPM) when the script filename is empty or incorrect.

Reproduction

1. Open Horde 6 URL in Firefox on Android
2. Log in successfully
3. Small text appears: "no input file specified"
4. Same result if using desktop browser with mobile device emulation

Environment

• Horde 6 (current FRAMEWORK_6_0)
• Firefox on Android
• Also reproducible via desktop mobile emulation mode

Reported by: Ruud (via direct message)