[client] Add light mode with system, light, and dark theme options (#7344)

* desktop UI light mode

* Theme review fixes plus macOS window outline fix

* Windows runtime chrome re-theming plus apply serialization

* Windows chrome threading and theme event ordering fixes

* Darken toggle and setting sidebar text

* resolve theme appearance, apply on UI thread

* read theme once per window

* Re-assert Windows dark opt-in after SetTheme

* split app-wide GTK theming from per-window chrome

* Update Wails dependency and checksums

* KDE tray icon panel fix

* Five review fixes: theme ordering, cgo dedup, KDE panel resolution

* Path guard hardening, toggle contrast, windows comment

* non-vacuous escape tests

* Default view edits

* Polish settings nav, controls, borders, and disc

* Profiles settings boarder, modals, and buttons

* Additional edits based on feedback

* Switch colors away from slight blue hue

* Update missing lang

* Fix vertical tab active view

client/ui/frontend/src/components/CopyToClipboard.tsx

@@ -81,7 +81,7 @@ export const CopyToClipboard = ({
             aria-live={"polite"}
             className={cn(
                 "group/copy wails-no-draggable pointer-events-auto inline-flex cursor-default items-center gap-2 rounded-sm text-left outline-none",
-                "focus-visible:ring-2 focus-visible:ring-white/60 focus-visible:ring-offset-2 focus-visible:ring-offset-nb-gray-940",
+                "focus-visible:ring-2 focus-visible:ring-nb-gray-50/60 focus-visible:ring-offset-2 focus-visible:ring-offset-nb-gray-940",
                 className,
             )}
         >