feat(alerts): Steward's own confirm dialog, a verdict-first rules list, and a rule page in three sections (#5314, #5315, #5317)

Confirm dialog (#5314):
- Every data-confirm form now asks in one native <dialog> (base.html + static/confirm.js)
  instead of window.confirm.
- The question becomes the heading and what follows it the detail; the act's
  button is named after the form's own button; Cancel has the focus and Esc
  backs out. Optional data-confirm-title/-detail/-action/-dismiss attributes.
- All 27 existing uses work as they are. Cancelling a run says 'Keep running'.

Alerts list (#5315):
- A verdict line (what is firing, how many rules, where notifications go,
  or 'notifies nobody yet' with a link) replaces the empty Active card.
- Each rule's name opens it; rows show 'last fired' and fold fire/clear into
  the condition; History and Disable stay; Delete leaves the list.
- .docker-verdict becomes the shared .page-verdict.

Rule page (#5317):
- Named for the rule (title and crumb), with when it last fired and how many
  changes of state it holds.
- Three sections: what it watches, when it fires (checks side by side,
  seconds echoed as a duration), what happens (where notifications go, no-data,
  the playbook, whose fields stay folded until ticked).
- Delete at the foot, behind the dialog, saying its history goes with it.

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

tests/plugins/docker/test_docker_page.py

@@ -73,7 +73,7 @@ async def test_a_crash_loop_comes_first_and_a_stale_row_says_so(app):
                        containers=[_crow(loop, exit_failed=True), _crow(old, stale=True)], containers_total=2)
 
     # #5298: the verdict first; each problem section carries its own count (#5214).
-    assert page.index('class="docker-verdict"') < page.index("Needs attention")
+    assert page.index('class="page-verdict"') < page.index("Needs attention")
     assert "1 needs attention" in page and "1 container running, 1 stopped" in page
     assert " unhealthy</span>" not in page and "Failed in the last 24h" not in page and "stat-strip" not in page
     card = page[page.index("Needs attention"):page.index("</section>")]