chore(release): redesign UI tokens and publish styles 0.8.26, ui 0.8.86

Visual-only redesign ("instrument panel"): cool graphite neutrals for light
and dark, layered hairline elevation, larger radii, a mono token for
eyebrows/data, keycap-style solid and secondary buttons, recessed input
wells and tab tracks, a stronger dialog, and a theme-driven focus outline.
No props, outputs or behaviour change.

Also records the already-published csr 0.8.42, styles 0.8.25 and ui 0.8.85
changes (optional chaining/nullish in the reactive runtime, shared
theme/accent cookie sync, BackToTop hidden attribute).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ui/components/Card.wrn

@@ -377,9 +377,9 @@ component Card {
       width: 100%;
       min-width: 0;
       border: 1px solid var(--wrn-color-border);
-      border-radius: var(--wrn-radius-md);
+      border-radius: var(--wrn-radius);
       background: var(--wrn-color-surface);
-      box-shadow: none;
+      box-shadow: var(--wrn-shadow-1);
       transition:
         transform var(--wrn-motion-base) var(--wrn-ease-emphasized),
         border-color var(--wrn-motion-base) ease,
@@ -404,7 +404,7 @@ component Card {
       align-items: center;
       justify-content: space-between;
       padding: 0.85rem var(--wrn-card-padding);
-      background: var(--wrn-color-surface-2);
+      background: var(--wrn-color-surface-soft, var(--wrn-color-surface-2));
       color: var(--wrn-color-muted);
       font-size: 0.875rem;
     }