Add dynamic pages with clock, date, Home Assistant values and fonts

The hardcoded clock is now the built-in dynamic page "Clock". A dynamic page
has a background bitmap per time of day and up to 8 elements (clock, date,
Home Assistant value, text), each with position, alignment, font and overlay.
Pages are drawn on the ESP32, also for the web previews.

- Pages tab in the web UI: page editor with drag and drop, font upload
  (TTF/OTF converted in the browser to the FDF1 dot font format)
- Built-in fonts Small, Normal, Large and Full height (generated by
  tools/make_builtin_fonts.py), built-in bitmaps Pikachu and Pikachu yawning
- Home Assistant values over the REST API (URL and token in the HA tab)
- Settings version 4: evening settings removed (now time slots of the Clock
  page), old records are converted
- HA Mode dropdown lists the dynamic pages and bitmaps

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

src/esp32/logic/display_controller.h

@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 
+#include "logic/local_time.h"
 #include "logic/power_timer.h"
 #include "logic/settings.h"
 
@@ -19,8 +20,9 @@ public:
 class Frames
 {
 public:
-	virtual void clock(int hour, int minute, bool evening) = 0;
-	// Shown instead of the clock while WiFi is down (the time keeps running without it)
+	// The dynamic page selected as page, drawn for this time
+	virtual void dynamicPage(const LocalTime &time) = 0;
+	// Shown instead of a dynamic page while WiFi is down (the time keeps running without it)
 	virtual void noWifi(int hour, int minute) = 0;
 	// The bitmap selected as page
 	virtual void page() = 0;
@@ -32,8 +34,8 @@ public:
 
 enum class Page : uint8_t
 {
-	Clock,  // Pikachu with the time
-	Bitmap, // a bitmap (FlipdotFrames holds which one)
+	Dynamic, // a dynamic page, redrawn every minute (FlipdotFrames holds which one)
+	Bitmap,  // a bitmap (FlipdotFrames holds which one)
 };
 
 // Decides what the display shows and when it is powered, based on the time, the settings,
@@ -49,8 +51,8 @@ public:
 	// The power stays on that much longer after the last frame.
 	void setEffectTime(uint32_t ms);
 
-	// What is shown during the day. Call pageChanged() when the page or off bitmap
-	// itself changed.
+	// What is shown during the day. Call pageChanged() when the page, its content (e.g. a
+	// Home Assistant value) or the off bitmap changed.
 	void setPage(Page page);
 	void pageChanged();
 
@@ -66,14 +68,14 @@ public:
 	bool powerEnabled() const;
 
 	// Call often (every loop). time_valid is false until the time is synced over NTP.
-	// While WiFi is down for NO_WIFI_SHOW_TIME, "No WiFi" is shown instead of the clock.
-	void update(uint32_t now, bool time_valid, int hour, int minute, bool wifi_connected);
+	// While WiFi is down for NO_WIFI_SHOW_TIME, "No WiFi" is shown instead of a dynamic page.
+	void update(uint32_t now, bool time_valid, const LocalTime &time, bool wifi_connected);
 
 private:
 	enum class Screen
 	{
 		Unknown, // nothing sent since the last power on
-		Clock,
+		Dynamic,
 		NoWifi,
 		Page,
 		Live,
@@ -86,7 +88,7 @@ private:
 
 	ScheduleSettings _schedule;
 	ClockSettings _clock;
-	Page _page = Page::Clock;
+	Page _page = Page::Dynamic;
 	uint32_t _effect_time = 0;
 
 	bool _power_enabled = true;
@@ -94,8 +96,7 @@ private:
 	Screen _screen = Screen::Unknown;
 	int _shown_hour = -1;
 	int _shown_minute = -1;
-	bool _shown_evening = false;
-	uint32_t _content_revision = 0; // changed page, bitmap or live image
+	uint32_t _content_revision = 0; // changed page, its content, bitmap or live image
 	uint32_t _shown_revision = 0;
 
 	bool _live = false;
@@ -105,6 +106,6 @@ private:
 	uint32_t _wifi_lost_since = 0;
 
 	void _ensureOn();
-	void _showClock(int hour, int minute, bool no_wifi);
+	void _showDynamic(const LocalTime &time, bool no_wifi);
 	void _showOnce(Screen screen);
 };