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/chat/StatusRow.tsx

@@ -87,7 +87,7 @@ const TodoItemRow: React.FC<TodoItemRowProps> = ({ todo }) => {
 
   return (
     <div className="flex items-center min-w-0 py-0.5 gap-2">
-      <Tooltip delayDuration={200}>
+      <Tooltip>
         <TooltipTrigger asChild>
           <span className="flex-shrink-0">{statusIcon}</span>
         </TooltipTrigger>
@@ -103,7 +103,7 @@ const TodoItemRow: React.FC<TodoItemRowProps> = ({ todo }) => {
       >
         {todo.content}
       </span>
-      <Tooltip delayDuration={200}>
+      <Tooltip>
         <TooltipTrigger asChild>
           <span
             className={cn(