Hold one loading surface when opening an integration

[RhysSullivan]

Opening an integration walked the detail page through several placeholders in a
row. On a cold open the header printed the raw URL slug (postman-echo-9f2a)
before swapping it for the real name, and the Accounts pane showed a pulsing dot
and the words "Loading accounts…" — a loading vocabulary used nowhere else on
the page — before the real content arrived in a different box.

Each of those is one of our own internal boundaries: the catalog row request,
the plugin lookup that depends on it, the connections request. None is a fact
the person clicking an integration has any use for, and several short loading
states are worse than one longer one, because every transition is a fresh demand
on the eye.

What changed

• The detail page holds one skeleton until it knows what it is. Everything
  it renders — the name, whether the integration is built-in, which plugin owns
  the Accounts pane, the declared auth methods — comes from the catalog row, so
  rendering before that lands does not show less, it shows a different page.
• The skeleton is built from the same boxes the settled page uses (the tab
  strip's border and padding, then the pane that tab will fill), so content
  lands where the skeleton already was.
• The header holds a placeholder instead of printing the slug.
• The Accounts pane's "Loading accounts…" line is now a skeleton in the shape of
  the row it holds space for.
• asyncResultValue reads a result's retained value, so a background refresh
  cannot blank data the client already has.

Before

After

Verification

New scenario e2e/scenarios/integration-detail-loading-surface.test.ts, modelled
on the artifact loading-surface scenario. These states were only ever on screen
for a few hundred milliseconds, so a screenshot at one moment would miss them and
pass against the old code too. The page is sampled continuously on an animation
frame, from before the click until the detail page is live, and the assertion is
over everything that was ever on screen: no placeholder words, no raw slug in the
title, and a detail body whose box never changed size. Warm (a click from the
list) and cold (a direct URL in a fresh context) are both covered.

Against the pre-fix code the cold open fails on both counts — "Loading accounts" was on screen at sample 24 of 85 and the header printed the raw slug "postman-echo-9b15aea9" at sample 24 of 85. With the change the scenario passes.

bun run typecheck (packages/react), oxlint, and bun run format are clean.
Not checked: the other hosts' surfaces, and the wider e2e suite.

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