feat: move projects to sidebar rail and speed up session switching (#506)

* feat: move projects from header tabs to left sidebar rail

* refactor: remove variant from git generation session context

* feat: implemented drandrop action for navrails

* refactor: improve sidebar drag-and-drop smoothness and remove floating overlay

* fix: prevent mobile nav rail touch from closing drawer and opening menu

* fix: hide header tabs on desktop

* fix: prevent session flicker when switching projects

* style: soften chat panel divider borders

* style: improve icon contrast across core navigation

* fix: stabilize session selection during project switching

* style: unify sidebar surfaces and transparent section layers

* style: remove UI shadows and keep only scroll shadow

* perf: speed up project switching with cached session loading

* perf: speed up Git changes view and background refresh

* perf: make session switching lighter and less aggressive

* perf: optimized sessions list loading while project switching

* perf: smooth chat rendering and reduce interaction spikes

* fix: restore reliable load older messages visibility

packages/ui/src/components/views/SettingsWindow.tsx

@@ -25,7 +25,7 @@ export const SettingsWindow: React.FC<SettingsWindowProps> = ({ open, onOpenChan
           className={cn(
             'fixed z-50 top-[50%] left-[50%] translate-x-[-50%] translate-y-[-50%]',
             'w-[90vw] max-w-[960px] h-[85vh] max-h-[900px]',
-            'rounded-xl border shadow-2xl overflow-hidden',
+            'rounded-xl border shadow-none overflow-hidden',
             'bg-background'
           )}
         >