**Stacked on #4131** — targets `feat/queue-metrics-and-health`, not
`main`. GitHub will auto-retarget this to `main` once #4131 merges.
(Targeting `main` now would wrongly include all of #4131's own commits.)
UI polish for the Queue metrics & health pages (TRI-12068). 49 commits,
all under `apps/webapp/app/` — no engine/ClickHouse/package changes.
**Highlights**
- **Layout** — consolidated queue-detail header into one filter bar;
shared `MetricsLayout` spacing (2.5 scale); paused-queue banner
mirroring the environment-paused banner.
- **Charts** — inline legends under titles; threshold gradient coloring
(Env saturation orange only >100%; Concurrency orange only at/over the
limit); fullscreen legend spacing; result caching so tab switches don't
reload; brighter hover cursor + full x-axis labels.
- **Tables** — whole-row click via stretched link; custom Queues icon;
removed column sorting; Limit-cell spacing + hover-bright; "Limited by"
tooltip sizing.
- **Controls** — Pause moved into the filter bar (orange label +
accurate tooltip copy); restyled override-concurrency modal.
- **Copy** — plain-language pass; inline colour swatches; Throttled
reads "% of current period".
Also consolidated the three queue-metrics `.server-changes` notes into
one.
**Known follow-up (not in this PR):** the Concurrency-keys table is
capped at 50 keys (union of live Redis backlog + ClickHouse history, no
single cursor across both) and truncates silently — fine for most
queues, a real limit for high-cardinality per-tenant keys.
Verified locally against the `queue-metrics-demo` seed; `pnpm typecheck
--filter webapp` passes.
James Ritchie
a585deab55