feat: a node map and a calendar on ui-new, a banner switch on the L2

- Nearby › Map (ui-new): the positioned nodes and you on one view, scaled
  to fit, with north, a scale bar and the selected node's name and
  distance; Left / Right picks a node, Up / Down zooms on it, Enter opens it.
- Clock tools › Calendar (ui-new): the month with today and the alarm's
  days; a tight grid on small screens, Left / Right pages the months.
- L2 Settings: a Message banner switch (on / off) in place of ui-new's
  three-way alert setting.
- Simulator: sim_nodes() puts eight positioned contacts around Kraków.

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

examples/companion_radio/ui-new/CalendarView.h

@@ -1,7 +1,8 @@
 #pragma once
 // The current month as a grid of days, weeks from Monday, today in a filled
 // soft box, marked days (the alarm's) underlined. For the room a tall e-ink
-// screen has under its clock (the Clock page, the lock screen).
+// screen has under its clock (the Clock page, the lock screen), and Clock
+// tools > Calendar. `tight`: rows a line apart, for a 64-pixel screen.
 
 #include <time.h>
 #include <helpers/ui/DisplayDriver.h>
@@ -15,25 +16,30 @@ using calmath::firstCol;
 using calmath::weeks;
 
 // Its height: the day names, a rule, then a row a week.
-inline int height(DisplayDriver& d, const struct tm& t) {
+inline int height(DisplayDriver& d, const struct tm& t, bool tight = false) {
+  if (tight) return (1 + weeks(t)) * d.getLineHeight() + 1;
   return (1 + weeks(t)) * (d.getLineHeight() + 2) + 3;
 }
 
-// `marked`: bit (day - 1) set for each day to underline.
-inline void draw(DisplayDriver& d, int x, int y, int w, const struct tm& t, uint32_t marked = 0) {
+// `marked`: bit (day - 1) set for each day to underline. `today`: box
+// t.tm_mday (off for another month than the current).
+inline void draw(DisplayDriver& d, int x, int y, int w, const struct tm& t, uint32_t marked = 0,
+                 bool tight = false, bool today = true) {
   static const char* const NAMES[] = { "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su" };
-  const int lh = d.getLineHeight(), step = lh + 2, cw = w / 7;
+  static const char* const INITIALS[] = { "M", "T", "W", "T", "F", "S", "S" };
+  const int lh = d.getLineHeight(), step = tight ? lh : lh + 2, cw = w / 7;
   const int x0 = x + (w - 7 * cw) / 2;
   d.setColor(DisplayDriver::LIGHT);
-  for (int c = 0; c < 7; c++) d.drawTextCentered(x0 + c * cw + cw / 2, y, NAMES[c]);
-  info::rule(d, x0, y + lh + 1, 7 * cw);
-  const int top = y + step + 3, col0 = firstCol(t), n = daysIn(t.tm_year, t.tm_mon);
+  for (int c = 0; c < 7; c++) d.drawTextCentered(x0 + c * cw + cw / 2, y, (tight ? INITIALS : NAMES)[c]);
+  info::rule(d, x0, y + (tight ? lh - 1 : lh + 1), 7 * cw);
+  const int top = y + (tight ? lh + 1 : step + 3), col0 = firstCol(t), n = daysIn(t.tm_year, t.tm_mon);
   char buf[3];
   for (int day = 1; day <= n; day++) {
     const int k = col0 + day - 1, cx = x0 + (k % 7) * cw, cy = top + (k / 7) * step;
     snprintf(buf, sizeof(buf), "%d", day);
-    if (day == t.tm_mday) {
-      d.fillSoftRect(cx + 1, cy - 1, cw - 2, lh + 2);
+    if (today && day == t.tm_mday) {
+      if (tight) d.fillSoftRect(cx, cy - 1, cw, lh);
+      else d.fillSoftRect(cx + 1, cy - 1, cw - 2, lh + 2);
       d.setColor(DisplayDriver::DARK);
       d.drawTextCentered(cx + cw / 2, cy, buf);
       d.setColor(DisplayDriver::LIGHT);
@@ -42,8 +48,8 @@ inline void draw(DisplayDriver& d, int x, int y, int w, const struct tm& t, uint
     }
     if (marked & (1UL << (day - 1))) {   // under the number, in the gap below it
       const int uw = d.getTextWidth(buf);
-      d.setColor(day == t.tm_mday ? DisplayDriver::DARK : DisplayDriver::LIGHT);
-      d.fillRect(cx + (cw - uw) / 2, cy + lh, uw, 1);
+      d.setColor(today && day == t.tm_mday ? DisplayDriver::DARK : DisplayDriver::LIGHT);
+      d.fillRect(cx + (cw - uw) / 2, cy + (tight ? lh - 2 : lh), uw, 1);
       d.setColor(DisplayDriver::LIGHT);
     }
   }