feat(ui): unify overlay animations and trim tooltip delays

Use base-ui's transition-status pattern (data-starting-style /
data-ending-style) for Dialog, DropdownMenu, Select, Tooltip and Popover
so open/close animate consistently at 150ms ease-out without flicker.
Wrap dialog popups in a centered flex container so the scale animation
no longer fights with translate-based positioning, and switch
PendingChangesBar to a real Popover so it actually animates closed.

Convert ScheduledTaskEditorDialog from raw Radix to the shared Dialog
wrapper, give ScheduledTasksDialog a stable min-height to prevent layout
shift mid-animation, and reset NewWorktreeDialog form state on open
instead of close so fields don't empty during the close transition.

Drop tooltip delay from 700ms to 300ms globally and remove all
per-component overrides except the model/variant/agent selectors in the
chat input (600ms).

packages/ui/src/components/sections/remote-instances/RemoteInstancesPage.tsx

@@ -150,7 +150,7 @@ const HintLabel: React.FC<{ label: string; hint: React.ReactNode }> = ({ label,
   return (
     <span className="inline-flex items-center gap-1 typography-meta text-muted-foreground">
       <span>{label}</span>
-      <Tooltip delayDuration={700}>
+      <Tooltip>
         <TooltipTrigger asChild>
           <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
         </TooltipTrigger>