docs(queue): record why the queue is not a detail view

The measurement that decided it, dated, in NOTES.md -- the overlay's
rect against the main panel's, the three things that were genuinely
missing, and the computed containment of both candidate mounts. The
model itself goes in CLAUDE.md beside the overlay rule it extends.

CLAUDE.md

@@ -1775,6 +1775,61 @@ along untouched. Escape closes it and returns focus, and is attached
 only while the overlay is up — it is a dismissal, not a shortcut, which
 is why it is not a panel-scoped binding.
 
+**And an overlaid queue is a place, which is the whole of #55.** The
+pixels were already right: measured at the reference device's 424×439,
+the overlaid panel is 424×318 — `.main-panel`'s rect exactly — so a
+`DETAIL_LOADERS` mount would draw the same rectangle in the same spot.
+What was missing was the navigation model, and the defect was one
+measurement: opening the queue on Artists and pressing back moved the
+page *underneath* to Albums and left the queue up. So opening an
+**overlay** queue dispatches `navigate {view: 'queue'}` and opening a
+**column** sets the attribute as it always did — `utils/open-queue.ts`
+is that one decision, and both routes end at the same `open` attribute
+on the same element.
+
+Five things about it are load-bearing.
+
+**The queue is a screen exactly while it is an overlay**, which is the
+rule above rather than a second one: a column is a thing the user
+docked, so back must not undock it and a navigation must not take it
+away, while an overlay is covering the content and has to answer the
+platform's gesture. That also inherits the *computed, not
+breakpointed* property for free — the panel is drag-resizable, so a
+viewport breakpoint would be wrong by up to 180px.
+
+**It is in neither `VIEW_TAGS` nor `DETAIL_LOADERS`**, because there is
+nothing to mount; the panel is already in the document. That is not
+tidiness. `.main-panel > *` is paint-contained under a `.main-panel`
+that is, and `contain: paint` clips the `position: fixed` a `wa-popup`
+falls back to on the reference device's Chrome 113 (#60) — so the
+detail-view mount asked for in #55's Direction would have broken
+`queue-panel`'s working context menu on the one device the issue is
+about. Measured: the panel's ancestry is `layout style` all the way to
+`body`; a view inside the main panel is `content` under `content`.
+**No tier here can see that consequence** — CI's Chromium and WebKit
+both have the Popover API — so `queue-as-a-screen.spec.ts` asserts the
+*mechanism*, that the panel is not under a paint-contained ancestor.
+
+**A navigation to `queue` deliberately writes neither
+`dataset.activeView` nor `searchStore.setCurrentView`**, because both
+describe what is *in* the main panel and the queue covers that panel
+without replacing it. It publishes itself through `activeViewStore`
+with `isPrimary: false`, so the tab it was opened from stays lit —
+the same rule a detail view gets.
+
+**The entry is unwound from the panel's `open` attribute**, in the
+mutation observer `index.ts` already ran for `aria-expanded`, rather
+than at each of the four ways out. Escape, the scrim, the close button
+and the toggle all take that route, and a fifth added later gets it
+free. Without it the entry is orphaned and the *next* back press is the
+one that closes the queue — the reported defect moved one press later,
+which looks exactly like a press that did nothing.
+
+**And the way out is 44px on a phone.** With the panel spanning the
+whole width the scrim has no uncovered pixels at all, so the close
+button is the only pointer route out of a full-screen surface; it was
+**25×21px**.
+
 What this does **not** fix is `page-header` overflowing on its own:
 at 900×600 "New Smart Playlist" is still clipped to 114 of 162px with
 the queue *closed*. That is #69, and it cannot be fixed in