Add conversions for Home Assistant values: duration, time, own texts, auto unit

- Show as number (multiplier, decimals, auto unit W -> kW -> MW, without
  minus sign), duration (seconds/minutes/hours as 2h 21m, 2:21:00, 2:21 or
  smart), time (HA timestamps in local time, with weekday or date, or
  relative: over 34 min / 12 min geleden) or own texts per state.
- Page format 3; version 2 pages are converted. Version 2.7.0.

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

README.md

@@ -95,7 +95,7 @@ view of the display: it shows what the dots show right now, updated every 1.5 s.
 | Tab | What you can do |
 |-----|-----------------|
 | **Show** | Choose what the display shows during the day: a dynamic page (e.g. the built-in Clock: Pikachu with the time) or any bitmap. The schedule still decides when the display is on. |
-| **Pages** | Dynamic pages: a background bitmap per time of day (e.g. Pikachu from 00:00, yawning Pikachu from 17:00) with up to 8 elements on top: clock (`08:05`, `8:05`, optionally with seconds), date (7 formats, Dutch or English), Home Assistant value (entity or attribute, text before and after, multiplier, decimals), text, countdown to a date and time (smart `12 dagen` / `5 uur` / `34 min` / `0:45`, days, `12d 04:05`, with seconds; a text when it has passed), stopwatch (start, stop and reset in the Show tab, the editor and Home Assistant) and image (a bitmap at a position, fixed or chosen by a Home Assistant state, e.g. `weather ` + `cloudy`). Texts can scroll in a window at a chosen speed, and can contain the degree sign. Each element has a position (drag it on the preview), alignment, font and overlay (on top, box that clears the dots behind it, inverted). The preview is drawn by the ESP32, so it is exactly what the display shows. Built-in pages can be copied, not changed. Fonts: Small (3x5), Normal (5x7), Large (5x7 doubled), Full height (19 dot digits), and your own: upload a TTF/OTF, choose the height in dots, the browser converts it. |
+| **Pages** | Dynamic pages: a background bitmap per time of day (e.g. Pikachu from 00:00, yawning Pikachu from 17:00) with up to 8 elements on top: clock (`08:05`, `8:05`, optionally with seconds), date (7 formats, Dutch or English), Home Assistant value (entity or attribute, text before and after; shown as a number with multiplier, decimals, auto unit `1257 W` → `1.3 kW` and optionally without minus sign, as a duration `2h 21m` / `2:21:00` / `2:21` / `2 uur`, as a time from an HA timestamp `23:07` / `do 23:07` / `15-10 23:07` / `over 34 min`, or with own texts per state `printing=Bezig, standby=Klaar`), text, countdown to a date and time (smart `12 dagen` / `5 uur` / `34 min` / `0:45`, days, `12d 04:05`, with seconds; a text when it has passed), stopwatch (start, stop and reset in the Show tab, the editor and Home Assistant) and image (a bitmap at a position, fixed or chosen by a Home Assistant state, e.g. `weather ` + `cloudy`). Texts can scroll in a window at a chosen speed, and can contain the degree sign. Each element has a position (drag it on the preview), alignment, font and overlay (on top, box that clears the dots behind it, inverted). The preview is drawn by the ESP32, so it is exactly what the display shows. Built-in pages can be copied, not changed. Fonts: Small (3x5), Normal (5x7), Large (5x7 doubled), Full height (19 dot digits), and your own: upload a TTF/OTF, choose the height in dots, the browser converts it. |
 | **Schedule** | What is shown when, every day: blocks from a start time until the next block, each with up to 6 pages or bitmaps that rotate (each for its own time, 5 s to 1 hour), switching with the refresh effect or instantly. Rules: a Home Assistant state (entity or attribute, `=`, `is not`, `above`, `below`) that shows a page while it is true, adds it to the rotation while it is true, or shows it for a while when it becomes true; each rule is read at its own interval (2-600 s). A page chosen by hand (Show tab, HA "Mode") is shown until the next block starts; "Back to schedule" ends it earlier. The display schedule (Settings) still decides when the display is on. |
 | **Stopwatch** | Start, stop and reset the stopwatch that pages can show. |
 | **Bitmaps** | All bitmaps with a preview (the ones that pages or rules use in their own subsection): show one as the page, send it live, open it in the editor, delete it. The built-in ones (Nintendo, Pikachu, Pikachu yawning) can't be deleted, nor can a bitmap that a page uses as background. |