[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/Tooltip.tsx

@@ -81,12 +81,12 @@ export const Tooltip = ({
                         onPointerLeave={interactive ? scheduleClose : undefined}
                         onPointerDownOutside={interactive ? undefined : (e) => e.preventDefault()}
                         className={cn(
-                            "z-50 select-none text-xs text-nb-gray-100 shadow-lg",
+                            "z-50 select-none text-xs text-nb-gray-100 shadow-sm dark:shadow-lg",
                             "data-[state=delayed-open]:animate-in data-[state=closed]:animate-out",
                             "data-[state=closed]:fade-out-0 data-[state=delayed-open]:fade-in-0",
                             !interactive && "pointer-events-none",
                             contentClassName ??
-                                "rounded-md border border-nb-gray-850 bg-nb-gray-900 px-2 py-1",
+                                "rounded-md border border-nb-gray-800 bg-white px-2 py-1 dark:border-nb-gray-850 dark:bg-nb-gray-900",
                         )}
                     >
                         {content}