feat(eink): use the room of tall screens, add e-ink graphics

Tall screens stack the Sky view and the map over their rows, show more
recent chats, give favourite cards the heard age and distance, and put
the trail map under the trail summary. Wide screens put the page icons
on the header line.

E-ink only (Features::IS_EINK):
- a month calendar under the clock and on the portrait lock screen, with
  the alarm's days marked; the lock screen also lists unread messages,
  the alarm and the clock fields
- 8-hour charts in Status: battery, noise and SNR, mesh traffic
- an elevation profile under the trail map, with the climb and the top
- a compass rose and the path's hops on a contact's detail, arrows by
  the distance in Nodes rows and on favourite cards
- an ordered-dither fade under chart lines

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

examples/companion_radio/ui-new/StatusScreen.h

@@ -48,11 +48,28 @@ private:
   CayenneLPP _lpp;
   unsigned long _lpp_at = 0;
 
-  // History lines, one sample a minute (32 min).
-  static const unsigned long SAMPLE_MS = 60000;
+  // History lines, one sample a minute (32 min). E-ink draws them as charts
+  // (chartBlock()) over a longer span: a sample every 5 minutes, 8 hours.
+  static const int HIST_N = Features::IS_EINK ? 96 : 32;
+  static const unsigned long SAMPLE_MS = Features::IS_EINK ? 300000 : 60000;
+  static constexpr const char* HIST_SPAN = Features::IS_EINK ? "8 h ago" : "32 min";
   unsigned long _next_sample = 0;
   uint32_t _last_rx = 0;
-  info::History<32> _noise, _batt, _traffic;
+  info::History<HIST_N> _noise, _batt, _traffic;
+  // The SNR of each packet heard, the last 32 (e-ink's Radio chart), x4 dB.
+  info::History<32> _snr;
+  uint32_t _snr_rx = 0;
+
+  // A chart as a block (e-ink): `title` with the value now on its line, the
+  // chart under it.
+  template <int N>
+  void chartBlock(DisplayDriver& d, info::Flow& f, int rsv, const char* title, const char* now,
+                  const info::History<N>& hs, int min_span, bool bars, const char* span) {
+    const int lh = d.getLineHeight(), ch = 3 * lh;
+    if (!f.place(d.lineStep() + info::chartH(d, ch) + 2)) return;
+    info::valueRow(d, f.at, title, now, false, rsv, 1);
+    info::chart(d, 1, f.at + d.lineStep(), d.width() - rsv - 3, ch, hs, min_span, bars, span, "now");
+  }
 
   void addTab(uint8_t t, const char* label) { _tabs[_count] = t; _labels[_count] = label; _count++; }
   uint8_t tab() const { return _tabs[_cur]; }
@@ -104,9 +121,11 @@ private:
     }
     snprintf(a, sizeof(a), "%d dBm", (int)radio_driver.getTxPower());
     row(d, f, rsv, "TX power", a);
-    if (f.place(d.lineStep())) {   // label, the last half hour, the value now
-      const int nf = (int)radio_driver.getNoiseFloor();
-      if (nf) snprintf(a, sizeof(a), "%d dBm", nf); else strcpy(a, "-");
+    const int nf = (int)radio_driver.getNoiseFloor();
+    if (nf) snprintf(a, sizeof(a), "%d dBm", nf); else strcpy(a, "-");
+    if (Features::IS_EINK) {
+      chartBlock(d, f, rsv, "Noise", a, _noise, 6, false, HIST_SPAN);
+    } else if (f.place(d.lineStep())) {   // label, the last half hour, the value now
       info::valueRow(d, f.at, "Noise", a, false, rsv, 1);
       const int x0 = 1 + d.getTextWidth("Noise") + 6;
       const int x1 = d.width() - rsv - 2 - d.getTextWidth(a) - 6;
@@ -119,7 +138,8 @@ private:
       drawSignalBars(d, d.width() - rsv - 2 - d.getTextWidth(b) - 5, f.at, (int)(snr * 4));
     }
     snprintf(b, sizeof(b), "%.1f dB", radio_driver.getLastSNR());
-    row(d, f, rsv, "Last SNR", b);
+    if (Features::IS_EINK) chartBlock(d, f, rsv, "SNR", b, _snr, 20, false, "32 pkts");
+    else row(d, f, rsv, "Last SNR", b);
   }
 
 #if ENV_INCLUDE_GPS == 1
@@ -188,7 +208,9 @@ private:
     snprintf(a, sizeof(a), "%d.%02d V", mv / 1000, (mv % 1000) / 10);
     row(d, f, rsv, "Battery", a);
     row(d, f, rsv, "Source", board.isExternalPowered() ? "USB" : "Battery");
-    if (f.place(d.lineStep())) {
+    if (Features::IS_EINK) {
+      chartBlock(d, f, rsv, "Trend", nullptr, _batt, 20, false, HIST_SPAN);
+    } else if (f.place(d.lineStep())) {
       d.setCursor(1, f.at);
       d.print("Trend");
       const int x0 = 1 + d.getTextWidth("Trend") + 6;
@@ -229,7 +251,13 @@ private:
       snprintf(a, sizeof(a), "TX %lu", (unsigned long)totalTx());
       d.drawTextRightAlign(d.width() - rsv - 2, f.at, a);
     }
-    if (f.place(lh + 6)) info::spark(d, 1, f.at, d.width() - rsv - 3, lh + 3, _traffic, 4);
+    if (Features::IS_EINK) {   // packets per 5 minutes, as bars
+      const int ch = 3 * lh;
+      if (f.place(info::chartH(d, ch) + 2))
+        info::chart(d, 1, f.at, d.width() - rsv - 3, ch, _traffic, 4, true, HIST_SPAN, "now");
+    } else if (f.place(lh + 6)) {
+      info::spark(d, 1, f.at, d.width() - rsv - 3, lh + 3, _traffic, 4);
+    }
 
     static const uint8_t MSG[]    = { PAYLOAD_TYPE_TXT_MSG, PAYLOAD_TYPE_GRP_TXT };
     static const uint8_t ADVERT[] = { PAYLOAD_TYPE_ADVERT };
@@ -319,6 +347,7 @@ public:
 
   // Called from the UI loop on every pass: one sample a minute for the lines.
   void sample() {
+    if (Features::IS_EINK) samplePacket();
     const unsigned long now = millis();
     if (_next_sample && (long)(now - _next_sample) < 0) return;
     _next_sample = now + SAMPLE_MS;
@@ -329,8 +358,13 @@ public:
     if (_last_rx || rx) _traffic.push((int16_t)(rx - _last_rx > 30000 ? 30000 : rx - _last_rx));
     _last_rx = rx;
   }
+  // On every pass: the SNR of a packet just heard (e-ink's Radio chart).
+  void samplePacket() {
+    const uint32_t rx = totalRx();
+    if (rx != _snr_rx) { _snr.push((int16_t)(radio_driver.getLastSNR() * 4)); _snr_rx = rx; }
+  }
 
-  const info::History<32>& battHistory() const { return _batt; }
+  const info::History<HIST_N>& battHistory() const { return _batt; }
 
   // Contacts heard from in the last hour (cached for 10 s: it walks them all).
   static int heardLastHour() {