Add a web UI to the clock firmware

- Web UI on port 80: live view of the display, choose the page (clock or
  a bitmap), bitmaps (list, show, live, edit, delete), draw / image upload
  with conversion in the browser, live mode, settings, Home Assistant
- Live view from a shadow buffer in the BROSE9323 driver (shownPixel)
- Settings in NVS with the original behaviour as defaults: schedule times,
  quarter hours, yawning Pikachu, No WiFi screen, flip time, status LED,
  Home Assistant broker (restart on change)
- Bitmaps on LittleFS; new 320 KB partition, ota slots now 1.31 MB
- DisplayController: pages, live mode, settings; app.cpp holds the objects
- README for the recovery app; docs for the web UI
- Tests: settings, time parsing, bitmap format and names, schedule with
  settings, pages and live mode (95 total)

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

src/esp32/display/frames.cpp

@@ -1,10 +1,11 @@
 #include "display/frames.h"
 
 #include <stdio.h>
+#include <string.h>
 
+#include "display/bitmap_store.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
 static const int CLOCK_X = 3;
@@ -13,13 +14,13 @@ FlipdotFrames::FlipdotFrames(BROSE9323 &display) : _display(display)
 {
 }
 
-void FlipdotFrames::clock(int hour, int minute)
+void FlipdotFrames::clock(int hour, int minute, bool evening)
 {
 	char time[6];
 	snprintf(time, sizeof(time), "%02d:%02d", hour, minute);
 
 	_display.fillScreen(0);
-	if (isEvening(hour))
+	if (evening)
 		_display.drawBitmap(CLOCK_X, 0, yawning_pikachu_bitmap_yawning_pikachu_black_border, 35, 19, 1);
 	else
 		_display.drawBitmap(CLOCK_X, 0, pikachu_bitmap_pikachu_black_border, 35, 19, 1);
@@ -40,11 +41,21 @@ void FlipdotFrames::noWifi(int hour, int minute)
 	_display.display();
 }
 
+void FlipdotFrames::page()
+{
+	_drawFullScreen(_page);
+}
+
+void FlipdotFrames::live()
+{
+	_drawFullScreen(_live);
+}
+
 void FlipdotFrames::logo()
 {
-	_display.fillScreen(0);
-	_display.drawBitmap(0, 0, nintendo_bitmap_Nintendo_new, 84, 19, 1);
-	_display.display();
+	uint8_t logo[BITMAP_BYTES];
+	if (loadBitmap("Nintendo", logo))
+		_drawFullScreen(logo);
 }
 
 void FlipdotFrames::blank()
@@ -52,3 +63,20 @@ void FlipdotFrames::blank()
 	_display.fillScreen(0);
 	_display.display();
 }
+
+void FlipdotFrames::setPageBitmap(const uint8_t *bitmap)
+{
+	memcpy(_page, bitmap, BITMAP_BYTES);
+}
+
+void FlipdotFrames::setLiveBitmap(const uint8_t *bitmap)
+{
+	memcpy(_live, bitmap, BITMAP_BYTES);
+}
+
+void FlipdotFrames::_drawFullScreen(const uint8_t *bitmap)
+{
+	_display.fillScreen(0);
+	_display.drawBitmap(0, 0, bitmap, BITMAP_WIDTH, BITMAP_HEIGHT, 1);
+	_display.display();
+}