Align Configure thresholds link, extend upstream coloring to cards, convert Gateway events to a table

ROADMAP.md

@@ -232,3 +232,5 @@ Roughly in priority order:
 `v0.16.53` fixes the "Configure thresholds" popup on the Certificates page (added in v0.16.51) rendering with its first input floating oddly beside the title instead of below it. The cause: `.settings-form` is a shared two-column CSS grid, and the dialog's heading block was placed as a plain grid child instead of spanning both columns like every other full-width element in a settings form already does (`.dialog-actions`, error text, a `<label>` wrapping a textarea). That left the "Renewing-soon warning" field sitting in the grid's second column of row one, directly beside the heading text. `.settings-form>.dialog-heading` is now added to that same existing full-span rule, so the heading spans the full width and the three threshold fields lay out normally beneath it.
 
 `v0.16.54` gives the Certificates table's Upstream column an accurate three-state color treatment instead of collapsing every non-numeric outcome into a single generic "no response." The underlying `upstreamHealth` data already distinguished four real states -- healthy (has a status code), unmonitored (monitoring intentionally turned off for that host), pending (no check has run yet), and a genuine failure (the check ran and errored or timed out) -- and the Hosted Site / Proxy host cards already labeled these correctly ("Monitoring paused", "Upstream check pending", etc.), but the new table only checked for a numeric status code and printed "no response" for everything else, including deliberately paused monitoring. The column now reads: green "running" dot with the status code for a healthy check, amber "idle" dot with "Monitoring paused" or "Check pending" for the two non-issue states, and a new red `.status-dot.bad` (added to styles.css, reusing the existing `--danger` token) with the actual error message for a real failure -- so a glance at the column now tells you whether something needs attention or is simply not being checked by design.
+
+`v0.16.55` is a batch covering three items reported against the Certificates and Logs pages. First, the "Configure thresholds" link on the Certificates page moves from floating level with the page title down onto the same line as the descriptive text beneath it, using a dedicated `.section-heading-row` flex row instead of the whole heading block being one flex row. Second, the three-state Upstream coloring added to the Certificates table in v0.16.54 (healthy / monitoring paused or check pending / genuine failure) is now applied consistently everywhere else that shows the same `upstreamHealth` data -- the Hosted Site, Proxy Host, and Streaming Host cards' upstream text now also gets a matching amber `.upstream-copy.idle` state for "Monitoring paused" and "Upstream/Target check pending", instead of rendering identically green to a real healthy check the way it did before. Third, the Logs page's "Gateway events" panel is converted from a stacked list of `.event-row` cards into a sticky-header table (`Time | Severity | Category | Message`), matching the Access requests table directly above it on the same page; the Message column is left free to wrap rather than forced onto one line, since event messages are free-form and of varying length, unlike the fixed-format columns elsewhere.