feat(ui): audit, alert rules and the rule form say things in words (#5212)

#5212 "Plain labels: no raw ids, scopes, metric keys or unexplained jargon",
batch 1:

- Audit log: each action reads as a sentence ("paused monitor"), with the
  code as its tooltip. Detail shows flags as yes/no, lists joined, a run's
  scope by name, spans as spans, and no ids the entity column already gives.
  The filter is now a picker of areas.
- Alert rules, history and Status say the condition in words: "is down",
  "Fullest disk >= 85%". Readings use metric_value, and history times use
  |ago.
- Rule form: sources and metrics by name, the threshold's unit, "fires
  when it is down/up" for an up/down metric instead of 0.5, and a metric
  reference built from the catalog.
- Schedules and Maintenance: viewers no longer see Run now, Pause, Edit,
  Delete or New. Intervals and next runs read as "every 2h" and "in 3h";
  a scope reads "Every alert on Host agent".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

steward/templates/alerts/list.html

@@ -44,10 +44,8 @@
                   {%- else %}<span class="tone-ok" style="font-size:0.8rem;" title="Within its threshold">quiet</span>{% endif -%}
                 </td>
                 <td style="color:var(--text-muted);font-size:0.85rem;">
-                  <span style="color:var(--text-dim);">{{ rule.source_module }}/</span>{{ rule.resource_name }}
-                  <span style="font-family:ui-monospace,monospace;font-size:0.8rem;">
-                    :{{ rule.metric_name }} {{ rule.operator.value }} {{ rule.threshold }}
-                  </span>
+                  {{ rule.resource_name }} {{ rule_condition(rule) }}
+                  <div style="font-size:0.75rem;color:var(--text-dim);">{{ source_label(rule.source_module) }}</div>
                 </td>
                 <td style="color:var(--text-muted);text-align:center;">{{ rule.consecutive_failures_required }} / {{ rule.consecutive_ok_required }}</td>
                 <td class="td-actions">