refactor(webui): unify shared shape system

webui/src/components/thread/WorkspaceControls.tsx

@@ -221,7 +221,7 @@ export function WorkspaceProjectPicker({
               "flex min-h-[48px] w-full cursor-default gap-3 px-3 py-2.5 focus:bg-muted/55",
             )}
           >
-            <span className="grid h-8 w-8 shrink-0 place-items-center rounded-[12px] bg-muted text-foreground/80">
+            <span className="grid h-8 w-8 shrink-0 place-items-center rounded-control bg-muted text-foreground/80">
               <Folder className="h-4 w-4" />
             </span>
             <span className="min-w-0 flex-1">
@@ -328,7 +328,7 @@ export function WorkspaceAccessMenu({
           aria-label={accessAriaLabel}
           title={accessLabel}
           className={cn(
-            "thread-composer-access touch-target min-w-0 max-w-[min(12.5rem,42vw)] whitespace-nowrap rounded-[10px] border border-transparent font-semibold shadow-none",
+            "thread-composer-access touch-target min-w-0 max-w-[min(12.5rem,42vw)] whitespace-nowrap rounded-control border border-transparent font-semibold shadow-none",
             isHero ? "h-8 px-2.5 text-[12px]" : "h-9 px-3 text-[12.5px]",
             isFull
               ? "bg-transparent text-orange-600 hover:bg-orange-500/8 dark:text-orange-300 dark:hover:bg-orange-400/10"