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/providers/ProvidersPage.tsx

@@ -634,7 +634,7 @@ export const ProvidersPage: React.FC = () => {
                   <div className="py-1.5">
                     <label className="typography-ui-label text-foreground flex items-center gap-1.5">
                       {t('settings.providers.page.auth.apiKeyLabel')}
-                      <Tooltip delayDuration={1000}>
+                      <Tooltip>
                         <TooltipTrigger asChild>
                           <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
                         </TooltipTrigger>
@@ -837,7 +837,7 @@ export const ProvidersPage: React.FC = () => {
                 <div className="py-1.5">
                   <label className="typography-ui-label text-foreground flex items-center gap-1.5">
                     {t('settings.providers.page.auth.apiKeyLabel')}
-                    <Tooltip delayDuration={1000}>
+                    <Tooltip>
                       <TooltipTrigger asChild>
                         <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
                       </TooltipTrigger>