fix: close the review findings on the issue wave

Ported from d719fb77 (#1717); the hatch draw-order, PDF and
recovery-settle hunks stay out (main owns those paths).

- La16 was still billed at 4 B/px: the no-conversion special case
  keyed on native_bpp == 4, which La16 also is — but only Rgba8 is a
  real move in into_rgba8, so La16's decode peak is 8. The case now
  keys on the color type, and a table test pins every layout's peak
  (plus GIF's screen+frame 8) so the accounting can't silently drift.
- json_values_match: an integer beyond f64 precision no longer matches
  a float it merely rounds onto; a mixed pair matches only when the
  float is whole and converts back to exactly that integer (also the
  fuzz finding of 9262d63f).
- ocs-control.js resolves `ready` with the API object instead of
  window.ocsControl, which is still undefined when the bridge already
  exists as the script runs (built before the first settle, avoiding
  the temporal-dead-zone throw of a later const); DATALINK on web says
  the typed path is superseded by the picker instead of silently
  discarding it.

(cherry picked from commit d719fb77)

locales/ru-RU/opencadstudio.ftl

@@ -275,6 +275,7 @@ command-copy =
     .mode = COPY  Задайте режим копирования [Single/Multiple] <Multiple>:
 
 common =
+    .browser-cannot-open-typed-path = Браузер не может открыть введённый путь; выберите файл.
     .recover-drawing = Восстановление чертежа
     .restore-it-as-a-recovered-tab-or-discard-the-copy = Восстановите его на отдельной вкладке или удалите копию.
     .name-has-an-autosave-copy-newer-than-the-last-save = У «__ocs_fmt_0__» есть копия автосохранения новее последнего сохранения.