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/views/git/AIHighlightsBox.tsx

@@ -26,7 +26,7 @@ export const AIHighlightsBox: React.FC<AIHighlightsBoxProps> = ({
     <div className="space-y-2 rounded-xl border border-border/60 bg-transparent px-3 py-2">
       <div className="flex items-center justify-between gap-2">
         <p className="typography-micro text-muted-foreground">{t('gitView.commit.aiHighlights.title')}</p>
-        <Tooltip delayDuration={1000}>
+        <Tooltip>
           <TooltipTrigger asChild>
             <Button
               variant="ghost"