fix(frontend): adjust sheet rendering and dialog z-index

Author: OpenCode Agent

frontend/src/components/navigation/MobileSheetHost.tsx

@@ -16,7 +16,7 @@ export function MobileSheetHost() {
 
   return (
     <>
-      {openSheet === 'repos' && <RepoQuickSwitchSheet isOpen onClose={close} />}
+      <RepoQuickSwitchSheet isOpen={openSheet === 'repos'} onClose={close} />
       {openSheet === 'files' && (
         <FileBrowserSheet
           isOpen

frontend/src/components/ui/dialog.tsx

@@ -20,7 +20,7 @@ const DialogOverlay = React.forwardRef<
   <DialogPrimitive.Overlay
     ref={ref}
     className={cn(
-      "fixed inset-0 z-50 bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
+      "fixed inset-0 z-[70] bg-black/80 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
       className
     )}
     {...props}
@@ -95,7 +95,7 @@ const DialogContent = React.forwardRef<
         autoFocus={false}
         aria-describedby={undefined}
         className={cn(
-          "fixed z-50 grid gap-4 border-0 sm:border bg-background shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
+          "fixed z-[70] grid gap-4 border-0 sm:border bg-background shadow-lg duration-200 data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
           fullscreen
             ? "inset-0 w-full h-full max-w-none max-h-none p-0 rounded-none"
             : mobileFullscreen