v1.49.0: content-fit zoom, swipe animation, wording, and the v1.47.0 review

Owner's batch:
- zoom now opens on what is DRAWN (rooms + 5% margin) for spaces with no
  background image; with one the image is the plan and still fits whole. A small
  plan on the square canvas no longer opens as a speck.
- swiping between spaces, and the kiosk carousel, slide sideways; honours
  prefers-reduced-motion.
- the room settings button reads 'Room settings' and lightens on hover.
- 'curation' is filtering everywhere: UI strings, docs, code.

Checked the yard while I was there: its drawing sits off-centre because it was
drawn that way — before the migration x spanned 0.12..0.54 with 0.12 and 0.46 of
margin. The migration added 0.1465 on each side, symmetrically. Content-fit zoom
makes it moot anyway.

From the v1.47.0 review:
- HP-1470-02: the picker let you delete the plan you had just selected — it is
  not in the stored config yet, so the server rightly called it free, and the
  save then stored a url with no file. The button is disabled, and since two
  clients can do this in either order, config/set now verifies every internal
  plan url against the disk under the write lock and answers .
  External and legacy urls are not ours to police.
- HP-1470-01: growth is bounded at the door rather than by deleting old files —
  that mistake cost real plans twice. check_quota refuses an upload that would
  push the store past 256 MB / 200 plans (1 GB / 1000 attachments) or leave less
  than 512 MB free. The plan list is capped at 60 newest with a total, and
  thumbnails load lazily.
- HP-1470-03: picking a saved plan waited for nothing and stored a fallback
  ratio when the signature had not arrived — a square plan came out stretched.
  It waits for the signature, binds the result to the dialog that asked, and the
  dialog preview is signed too.
- report §5: the last lifecycle comments still described age-based collection.

Not released yet — the owner asked for a release once the batch is done.

demo/smoke_saved_plans.mjs

@@ -56,9 +56,16 @@ const res = await page.evaluate(async () => {
   out.listClosed = !c._spaceDialog.pickSaved;
   out.saveEnabledAfterPick = !sr().querySelector('.dialog .btn.on[disabled]');
 
-  // удаление: занятый нельзя, свободный можно
+  // выбранный в этом же диалоге удалить нельзя: сохранение записало бы ссылку
+  // на несуществующий файл (HP-1470-02)
   await c._toggleServerPlans();
   await new Promise((r) => setTimeout(r, 60));
+  await c.updateComplete;
+  const rows2 = [...sr().querySelectorAll('.savedplan')];
+  const picked = rows2.find((r) => r.textContent.includes('f1.aaa.png'));
+  out.deleteDisabledForPicked = !!picked?.querySelector('.btn.danger[disabled]');
+  c._spaceDialog = { ...c._spaceDialog, planUrl: null };
+  await c.updateComplete;
   await c._deleteServerPlan('f2.bbb.png').catch(() => {});
   out.usedNotDeleted = !deleted.includes('f2.bbb.png');
   await c._deleteServerPlan('f1.aaa.png');
@@ -78,6 +85,7 @@ checkAll(res, {
   picked: true,
   listClosed: true,
   saveEnabledAfterPick: true,
+  deleteDisabledForPicked: true,
   usedNotDeleted: true,
   freeDeleted: true,
   rowGone: true,