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>

bun.lock

@@ -372,7 +372,7 @@
     },
     "packages/csr": {
       "name": "@wrnexus/csr",
-      "version": "0.8.41",
+      "version": "0.8.42",
       "dependencies": {
         "@wrnexus/core": "workspace:*",
       },
@@ -717,7 +717,7 @@
     },
     "packages/styles": {
       "name": "@wrnexus/styles",
-      "version": "0.8.23",
+      "version": "0.8.26",
       "dependencies": {
         "@wrnexus/core": "workspace:*",
         "@wrnexus/plugin": "workspace:*",
@@ -749,7 +749,7 @@
     },
     "packages/ui": {
       "name": "@wrnexus/ui",
-      "version": "0.8.84",
+      "version": "0.8.86",
       "dependencies": {
         "@wrnexus/core": "workspace:*",
       },