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/mcp/McpDropdown.tsx

@@ -152,7 +152,7 @@ export const McpDropdownContent: React.FC<McpDropdownContentProps> = ({ active,
             >
               <div className="min-w-0 flex-1">
                 <div className="flex items-center gap-2 min-w-0">
-                  <Tooltip delayDuration={300}>
+                  <Tooltip>
                     <TooltipTrigger asChild>
                       <span
                         className={cn(
@@ -305,7 +305,7 @@ export const McpDropdown: React.FC<McpDropdownProps> = ({ headerIconButtonClass
                     aria-label={tooltip}
                   />
                 ) : (
-                  <Tooltip delayDuration={300}>
+                  <Tooltip>
                     <TooltipTrigger asChild>
                       <span
                         className={cn(
@@ -427,7 +427,7 @@ export const McpDropdown: React.FC<McpDropdownProps> = ({ headerIconButtonClass
   // Desktop: use DropdownMenu
   return (
     <DropdownMenu open={open} onOpenChange={handleDropdownOpenChange}>
-      <Tooltip delayDuration={1000} open={open ? false : tooltipOpen} onOpenChange={handleTooltipOpenChange}>
+      <Tooltip open={open ? false : tooltipOpen} onOpenChange={handleTooltipOpenChange}>
         <TooltipTrigger asChild>
           <DropdownMenuTrigger asChild>
             {triggerButton}