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.

backend/app/routes/admin_logs.py

@@ -39,6 +39,8 @@ PAGE_MAX = 200
 FACET_EVENTS_MAX = 100
 
 Level = Literal["TRACE", "DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+# The filters a facet can leave out of its own count (`LogFilters.conditions`).
+Facet = Literal["levels", "sources", "user", "event"]
 # `none` selects the rows that have no account / no event code (a scheduler line, an anonymous
 # request) — a real value to filter on, not the absence of a filter.
 NONE = "none"
@@ -106,7 +108,7 @@ class LogFilters:
     since: datetime | None
     until: datetime | None
 
-    def conditions(self, skip: str | None = None) -> list:
+    def conditions(self, skip: Facet | None = None) -> list:
         """The WHERE conditions, ANDed by the caller. `skip` leaves one filter out: a facet counts
         its own values under every OTHER filter, so picking a level does not zero the other
         levels' counts (the way back), while a request pivot does narrow them (honest counts)."""
@@ -210,7 +212,7 @@ def log_facets(
     most frequent events — each counted under every filter but its own (`LogFilters.conditions`).
     `total` is the "all levels" count: every filter but the level one."""
 
-    def counts(col, skip: str, cap: int | None = None) -> list[dict]:
+    def counts(col, skip: Facet, cap: int | None = None) -> list[dict]:
         n = func.count().label("n")
         stmt = select(col, n).where(*filters.conditions(skip)).group_by(col).order_by(n.desc(), col)
         if cap is not None:

backend/tests/test_admin_logs.py

@@ -172,3 +172,20 @@ def test_a_facet_counts_under_every_other_filter_but_not_its_own(db, admin):
     assert body["total"] == 2
     # Every other facet counts under the level filter too.
     assert body["sources"] == [{"value": "worker", "count": 1}]
+
+
+@pytest.mark.parametrize(
+    ("params", "facet", "expected"),
+    [
+        ({"sources": ["worker"]}, "sources", {"api", "worker"}),
+        ({"user": "1"}, "users", {"1", "none"}),
+        ({"event": "sync.rss.failed"}, "events", {"http.request", "sync.rss.failed"}),
+    ],
+)
+def test_every_facet_keeps_its_siblings_under_its_own_filter(db, admin, params, facet, expected):
+    # The way back from a pick: the picked facet still offers the values it was picked from.
+    _add(db, _row(user_id=1), _row(source="worker", event="sync.rss.failed"))
+
+    body = admin.get("/api/admin/logs/facets", params=params).json()
+
+    assert {f["value"] for f in body[facet]} == expected