fix(activity): runs keep their true outcome and spend, the page reaches every kept row, a closing dialog leaves the server log alone

Backend
- A run's outcome write sits outside the job's own try: a database blip after a run that
  succeeded no longer records it as failed (the row waits for the next start's sweep).
- An interrupted run keeps what it spent (the sweep sums its quota rows, as finish does).
- The Scheduler's ad-hoc row says running while any backfill runs, not only the newest.
- recent_runs reads each job's last runs off its index instead of ranking the whole table.
- An interval change is stored with its audit row in one transaction, then rescheduled.
- One API instance per database is the stated contract (.env.example, jobruns).
- Turning full history on for a channel already complete records no run.
- Migration 0109 round-trips interrupted and ad-hoc runs; the run words' DB CHECKs are
  test-held to the enums; the account filter is one helper for the four activity reads.
- An audit row says how many of its request's log lines are still kept.

Frontend
- An "All" period reaches every row still kept (runs and admin actions outlive 90 days).
- Back/Forward is followed in place by the server log: a closing dialog no longer turns
  Live off; a pivot still opens a fresh log.
- Runs moved over from the audit log read their one-liner in the reader's language.
- Filter choices or accounts that failed to load say so beside the filters, with a retry.
- An old server-log link keeps its account, text and range; a remembered retired page
  opens its tab.
- A request whose lines are gone says so instead of linking to an empty list.
- The log lines and the history rows share one row frame, and the server log one list
  frame with the other tabs; an empty list is announced; each day's quota is readable.

backend/app/routes/_account.py

@@ -0,0 +1,17 @@
+"""The account filter the activity page's lists share (runs, admin actions, server log, quota): one
+filter bar drives them all, so the value it sends means the same on every tab.
+
+The value is an account id, or `none` — the rows no account made (the background) — a value to filter
+on, not the absence of a filter.
+"""
+
+from sqlalchemy import ColumnElement
+
+NONE = "none"
+# The `user` query parameter's shape on every route that takes it.
+PATTERN = r"^(none|[0-9]{1,10})$"
+
+
+def condition(column, value: str) -> ColumnElement[bool]:
+    """`column` (an account id column) narrowed to `value`."""
+    return column.is_(None) if value == NONE else column == int(value)