[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/typography/HelpText.tsx

@@ -11,7 +11,7 @@ type Props = {
 export const HelpText = ({ children, margin = true, className, disabled = false }: Props) => (
     <span
         className={cn(
-            "block text-[.81rem] font-light tracking-wide transition-all duration-300 dark:text-nb-gray-300",
+            "block text-[.81rem] font-light tracking-wide text-nb-gray-300 transition-all duration-300",
             margin && "mb-2",
             disabled && "pointer-events-none opacity-30",
             className,