Fixes:
- Card-less devices (Heltec V4) froze for seconds: a full contacts rewrite to
SPIFFS on every advert refresh triggered a multi-second GC in the mesh loop.
Coalesce advert-driven saves (a contact-set change still saves promptly); SD
boards unchanged. Flush on reboot/power-off so nothing is lost.
- Long translations (FR/DE/...) overflowed fixed-width labels: new
uiFitLabelWidth() shrinks the font to fit one line instead of clipping/wrapping
- applied to the message menu, confirm dialogs, and app-drawer tiles.
- Home signal graph: "tap for details" hint moved to bottom-right so it no longer
overlaps the "Sig" chip in longer languages.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
