Show status messages on the display

- Clock firmware: 'Connecting to WiFi...' and 'Getting the time...' at
  boot, 'Crashed!' in the OTA-only modes, and 'No WiFi' with the time
  when WiFi is down for over a minute (new DisplayController screen)
- Recovery app: shows its reason, the setup WiFi name, or its IP address,
  then powers the display off (flipdots keep the image)
- StatusScreen and drawTextLines shared by both apps
- Driver: ESP begin() no longer draws 'ESP Connected'
- Tests: No WiFi screen, short reason texts (70 total)

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

src/esp32/display/frames.cpp

@@ -3,6 +3,7 @@
 #include <stdio.h>
 
 #include "display/bitmaps.h"
+#include "display/text.h"
 #include "logic/schedule.h"
 
 // Horizontal offset that centers the 81 pixel wide clock on the 84 pixel display
@@ -31,6 +32,14 @@ void FlipdotFrames::clock(int hour, int minute)
 	_display.display();
 }
 
+void FlipdotFrames::noWifi(int hour, int minute)
+{
+	char time[6];
+	snprintf(time, sizeof(time), "%02d:%02d", hour, minute);
+	drawTextLines(_display, "No WiFi", time);
+	_display.display();
+}
+
 void FlipdotFrames::logo()
 {
 	_display.fillScreen(0);
@@ -43,13 +52,3 @@ void FlipdotFrames::blank()
 	_display.fillScreen(0);
 	_display.display();
 }
-
-void FlipdotFrames::message(const char *text)
-{
-	_display.fillScreen(0);
-	_display.setTextSize(1);
-	_display.setTextWrap(true);
-	_display.setCursor(0, 0);
-	_display.print(text);
-	_display.display();
-}