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/SettingsView.tsx

@@ -554,7 +554,7 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
               if (!Icon) return null;
 
               return (
-                <Tooltip key={page.slug} delayDuration={600}>
+                <Tooltip key={page.slug}>
                   <TooltipTrigger asChild>
                     <button
                       type="button"
@@ -587,7 +587,7 @@ export const SettingsView: React.FC<SettingsViewProps> = ({ onClose, forceMobile
         <div className="overflow-hidden transition-opacity duration-150 opacity-100">
           <div className="border-t border-border bg-sidebar px-2 py-1 space-y-0.5">
             {!runtimeCtx.isVSCode && (
-              <Tooltip delayDuration={300}>
+              <Tooltip>
                 <TooltipTrigger asChild>
                   <button
                     type="button"