[FEATURE] Re-order keys when long-pressing QWERTZ keys in German

[cweiske]

Problem / Use Case
To make the keys larger (also see #771), I switched from the German keyboard layout to QWERTZ.
To enter umlauts like äöü, I have to long-press a, o and u - then a popup shows additional keys like öòóôõø.
Selecting the "ö" is hard because it's not directly above the "o".

Details

Proposed Solution
When the language is set to "German", Urik should put the "ö" directly above the o, so that the finger travel way is minimized.
Same for "ä" over a, "ü" over u and "ß" over s.

Privacy Consideration

• Confirm this feature respects privacy-first principles (no network calls, no analytics, no data collection)

Related: #811