feat(l1): Status page and screen replace Radio/GPS/Sensors pages and Diagnostics

Home's Radio, GPS and Sensors pages become one Status page: four tiles split
by dotted rules (radio, GPS, battery, nodes), each a headline over a detail.
Enter opens the Status screen, tabs Radio / GPS / Sky / Power / Mesh /
System, which also takes over Tools > Diagnostics and Tools > Satellites
(the sky plot now lives in SkyView.h). GPS on/off moves to Enter on its tab.

New InfoKit.h holds the shared pieces, sized from the font: label/value row
(a long value takes its own line), centred section title, meter, chip, big
number with unit, switch, history line (one sample a minute) and a block
flow that scrolls a tab by whole blocks.

The Status page keeps the old Radio bit and shows when any of the three old
pages did; the save format is unchanged. The L1 degree sign was a cp437
byte the UTF-8 renderer drew as a box; now U+00B0. The perf walk covers
every Home page and Status tab.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/NodePrefs.h

@@ -694,7 +694,7 @@ struct NodePrefs {  // persisted to file
   // Array indices match HomePageBit values.
   static const char* homePageLabel(uint8_t bit) {
     static const char* labels[HPB_COUNT] = {
-      "Clock", "Recent", "Radio", "Bluetooth", "Advert",
+      "Clock", "Recent", "Status", "Bluetooth", "Advert",   // Status: the old Radio slot (ui-new)
       "GPS", "Sensors", "Tools", "Shutdown", "Settings", "Messages", "Favourites", "Map"
     };
     return (bit < HPB_COUNT) ? labels[bit] : "";