[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/dialog/Dialog.tsx

@@ -23,7 +23,7 @@ const Overlay = forwardRef<ElementRef<typeof DialogPrimitive.Overlay>, OverlayPr
                 ref={ref}
                 className={cn(
                     "fixed inset-0 z-50 grid items-center justify-items-center overflow-y-auto px-10 py-16",
-                    "bg-black/60",
+                    "bg-black/25 dark:bg-black/60",
                     "data-[state=open]:animate-in data-[state=open]:fade-in-0",
                     exitAnimation &&
                         "data-[state=closed]:animate-out data-[state=closed]:fade-out-0",
@@ -67,7 +67,7 @@ export const Content = forwardRef<ElementRef<typeof DialogPrimitive.Content>, Co
                         className={cn(
                             "relative z-[52] mx-auto w-full outline-none ring-0",
                             "focus:outline-none focus:ring-0 focus-visible:outline-none focus-visible:ring-0",
-                            "rounded-lg border border-nb-gray-900 bg-nb-gray py-7 shadow-2xl",
+                            "rounded-lg border border-nb-gray-800 bg-nb-gray-940 py-7 shadow-2xl dark:border-nb-gray-900 dark:bg-nb-gray",
                             "data-[state=open]:animate-in data-[state=open]:fade-in-0",
                             "data-[state=open]:zoom-in-95 data-[state=open]:slide-in-from-left-1",
                             exitAnimation &&