Prepare v1.74.0-beta.3

Seven version sources move together to 1.74.0-beta.3; the changelog
sections in both languages close over what has landed since beta.2, the
release notes carry the two shipped bullets on each side with the grouped
small-fixes bullet last, and STATUS says what this beta is.

What the user gets: dragging the plan is smooth again — a gesture frame
now moves what is already drawn by a composited transform, and the scene
re-rasterizes on a budget (100 ms, or a 15 % shift) instead of on every
frame, which on the owner's 144 Hz Firefox cost 200 ms per frame with the
refresh driver skipping 124-144 ticks a second waiting for paint (#531);
and the printed plan is about a third larger, because the in-plan
dimension labels shrank by a quarter and the separate column of external
dimensions is gone, so the drawing keeps a whole scale step (#530).

The speed verdict for #531 is deliberately not claimed here: headless
Firefox and Chromium hold 60 fps on both the old and the new path, so it
is owed by a profile from the owner's machine on the same pan.

`npm test` 2528/0/1 skip, release contract green on all seven sources,
bundle 287 238 B gzip inside the ceiling, docs strict green.

The `Release:` trailer is what asks CI for the heavy gates — smokes,
golden and the full performance comparison — on this exact SHA (#479).

Issue: #531
User-Visible: yes
Release: v1.74.0-beta.3

docs/RELEASE-NOTES.md

@@ -1,20 +1,18 @@
-<!-- release: v1.74.0-beta.2 -->
+<!-- release: v1.74.0-beta.3 -->
 
 ## Основное
 
-- План, доставшийся от времён «комнат без стен», снова редактируется: наследие снимается при первом сохранении, а не запирает план наглухо ([#529](https://github.com/Matysh/houseplan-card/issues/529)).
-- План снова плавный в Firefox: тень маркера больше не перезапускает анимацию у всех значков разом ([#524](https://github.com/Matysh/houseplan-card/issues/524)).
-- Карточка скачивается на 12,8 КБ меньше при холодном старте ([#526](https://github.com/Matysh/houseplan-card/issues/526)).
+- Перетаскивание плана снова плавное: кадр жеста сдвигает уже нарисованное вместо того, чтобы рисовать весь план заново ([#531](https://github.com/Matysh/houseplan-card/issues/531)).
+- Печатный план стал крупнее примерно на треть: размеры встали на сам чертёж, а столбец выносов сбоку убран ([#530](https://github.com/Matysh/houseplan-card/issues/530)).
 - Мелкие исправления и улучшения.
 
 ## Highlights
 
-- A plan left over from the era of “rooms without walls” can be edited again: the leftover is cleaned up on the first save instead of locking the plan completely ([#529](https://github.com/Matysh/houseplan-card/issues/529)).
-- The plan is smooth again in Firefox: a marker's shadow no longer restarts an animation on every marker at once ([#524](https://github.com/Matysh/houseplan-card/issues/524)).
-- The card downloads 12.8 KB less on a cold start ([#526](https://github.com/Matysh/houseplan-card/issues/526)).
+- Dragging the plan around is smooth again: a gesture frame moves what is already drawn instead of redrawing the whole plan ([#531](https://github.com/Matysh/houseplan-card/issues/531)).
+- The printed plan is about a third larger: the dimensions now sit on the drawing itself and the separate column beside it is gone ([#530](https://github.com/Matysh/houseplan-card/issues/530)).
 - Small fixes and improvements.
 
 Сообщество / Community: [Telegram](https://t.me/ha_houseplan)
 
-[Полный список изменений на русском](https://github.com/Matysh/houseplan-card/blob/v1.74.0-beta.2/docs/CHANGELOG.ru.md)
-· [Full changelog in English](https://github.com/Matysh/houseplan-card/blob/v1.74.0-beta.2/docs/CHANGELOG.md)
+[Полный список изменений на русском](https://github.com/Matysh/houseplan-card/blob/v1.74.0-beta.3/docs/CHANGELOG.ru.md)
+· [Full changelog in English](https://github.com/Matysh/houseplan-card/blob/v1.74.0-beta.3/docs/CHANGELOG.md)