Adds a System Name text-entry page (hint 'e.g. Living Room', 1-40 char
validation) and a data-driven System Settings row for it. Saving persists
locally and nudges the background sync; conflict/invalid results surface
the message and restore the previous name. Extends the settings-menu
tests.
Settings now shows Proclamations, Audio Options, System Settings, System
Logs, and Back. The new SystemSettingsPage groups Email Address, License
Key, WiFi Setup, Time Zone Setup, and Date Format, driven by the pure
settings::systemSettingEntries() list so future entries need one row, not
new menu plumbing. Adds unit tests for the entry list.
NeilClack