[gpaste-reloaded@feuerfuchs.eu] Add option to reverse history order (newest at bottom)

[hthienloc]

What’s changed

• added a new checkbox setting “Reverse history order (newest at bottom)” in settings‑schema.json
• bound setting in applet.js and implemented logic to flip the order of displayed entries during normal browsing and when searching
• introduced helper _onSettingsUpdated() to reload the menu on setting changes minor refactoring of applet.js for readability and a couple of style improvements

Why

Requested in #8042.

[fredcw]

You don't need comments that say what you've changed e.g. // refresh will handle highlighting and ordering

You've swapped spaces for tabs in settings-schema.json

[hthienloc]

@fredcw Can you check again?