[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/switches/SwitchItemGroup.tsx

@@ -48,7 +48,7 @@ export const SwitchItemGroup = ({
                 aria-label={ariaLabel}
                 aria-labelledby={ariaLabelledBy}
                 className={cn(
-                    "flex shrink-0 overflow-hidden rounded-lg border border-nb-gray-850 bg-nb-gray-910 p-1",
+                    "flex shrink-0 overflow-hidden rounded-lg border border-nb-gray-800 bg-nb-gray-910 p-1 dark:border-nb-gray-850",
                     disabled && "pointer-events-none opacity-50",
                     className,
                 )}