library: the toolbar is a solid card under dark glass, because a backdrop blur over the frost lets titles through

src/views/Library.svelte

@@ -3583,18 +3583,23 @@
     /* ── dark glass ────────────────────────────────────────────────────────
        The ladder lives in global.css. Solid mode sees none of this.
 
-       The toolbar was the loudest surface on the page and it was loud for two
+       The toolbar was the loudest surface on the page, measured on 2026-08-27
-       compounding reasons, both measured on 2026-08-27 with a known-colour
+       with a known-colour ground substituted behind the window
-       ground substituted behind the window (research/scroll-diag/glassshot.mjs):
+       (research/scroll-diag/glassshot.mjs): its 0.82 fill over the frost
-       its own fill nets 0.82 + 0.7075x0.18 = 0.947 — a slab by alpha alone —
+       netted 0.947 — a slab by alpha alone — and dropping fill and filter
-       AND its backdrop-filter samples the see-through pane, which the
+       made it the see-through card that shipped. It is SOLID again by
-       compositor flattens against black (the measurement lives in
+       Kyle's word (2026-09-09: "just make it a solid bar"), and on purpose:
-       Sidebar.svelte). Chroma of the shipped bar, blue-minus-red over a
+       a backdrop-filter over the pane's frost cannot hide thin content —
-       #6b3fa8 ground: +2, i.e. dead. Fill alone got it to +12; dropping the
+       Chromium paints the filtered backdrop OVER the original, so a title
-       filter as well got it to +16, against +30 for the bare pane beside it.
+       on bare frost stays crisp under the haze (measured that day, chroma
-       Both halves were needed, so both are here. */
+       +11 with the filter vs +17 without) — and the periscope twin built
+       that afternoon (a pane-level copy of the bar over a deepened band
+       cut, fogged by a page clone, GlassBar's pattern) still read as
+       broken on his screen and went the same day. An opaque card floating
+       on the glass: the elevated surface at full strength, hairline and
+       shadow as before, nothing behind it to sample. */
     :global(:root.glass) .lib-toolbar {
-        background: rgba(255, 255, 255, 0.06);
+        background: var(--bg-elevated);
         backdrop-filter: none;
         -webkit-backdrop-filter: none;
     }