fix(diagnostics): honest live console after review

- Live stops polling on a failed read and marks the list as possibly
  stale (with Retry), instead of re-raising the error dialog every tick.
- While live, a refetch reads the newest page only, whatever the cache
  holds (a late "Load older", a revisited filter set).
- Copy is disabled and the list dimmed while a filter change loads.
- Dates follow the UI language; the pivot chip uses the shared .chip.
- Tests: query-string wire test, Copy, every facet's skip key.

frontend/src/i18n/locales/en/adminLogs.json

@@ -26,6 +26,7 @@
   "showRequest": "Only this request's lines",
   "showJob": "Only this job's lines",
   "empty": "No lines match the filters.",
+  "stale": "The last refresh failed; what you see may be out of date.",
   "count_one": "{{count}} line loaded · newest first",
   "count_other": "{{count}} lines loaded · newest first",
   "older": "Load older",

frontend/src/i18n/locales/hu/adminLogs.json

@@ -26,6 +26,7 @@
   "showRequest": "Csak ennek a kérésnek a sorai",
   "showJob": "Csak ennek a jobnak a sorai",
   "empty": "Nincs a szűrésnek megfelelő sor.",
+  "stale": "Az utolsó frissítés nem sikerült, amit látsz, elavult lehet.",
   "count_one": "{{count}} sor betöltve · a legújabb felül",
   "count_other": "{{count}} sor betöltve · a legújabb felül",
   "older": "Régebbiek betöltése",