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/multirun/MultiRunLauncher.tsx

@@ -56,7 +56,7 @@ interface MultiRunLauncherProps {
 
 /** Info tooltip - small icon that shows helper text on hover */
 const InfoTip: React.FC<{ children: React.ReactNode }> = ({ children }) => (
-  <Tooltip delayDuration={200}>
+  <Tooltip>
     <TooltipTrigger asChild>
       <button type="button" tabIndex={-1} className="inline-flex items-center justify-center text-muted-foreground/50 hover:text-muted-foreground transition-colors">
         <RiInformationLine className="h-3.5 w-3.5" />
@@ -605,7 +605,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
           <h1 className="typography-ui-label font-medium">{t('multirun.launcher.title')}</h1>
           {onCancel && (
             <div className="absolute right-0 flex items-center pr-3">
-              <Tooltip delayDuration={500}>
+              <Tooltip>
                 <TooltipTrigger asChild>
                   <button
                     type="button"
@@ -845,7 +845,7 @@ export const MultiRunLauncher: React.FC<MultiRunLauncherProps> = ({
                   onChange={handleFileSelect}
                   accept="*/*"
                 />
-                <Tooltip delayDuration={300}>
+                <Tooltip>
                   <TooltipTrigger asChild>
                     <button
                       type="button"