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/agents/AgentsPage.tsx

@@ -701,7 +701,7 @@ export const AgentsPage: React.FC = () => {
               <div className="flex min-w-0 flex-col gap-1.5">
                 <div className="flex items-center gap-1.5">
                   <span className="typography-ui-label text-foreground">{t('settings.agents.page.field.mode')}</span>
-                  <Tooltip delayDuration={1000}>
+                  <Tooltip>
                     <TooltipTrigger asChild>
                       <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
                     </TooltipTrigger>
@@ -778,7 +778,7 @@ export const AgentsPage: React.FC = () => {
               <div className={cn("flex min-w-0 flex-col", isMobile ? "w-full" : "sm:w-56 shrink-0")}>
                 <div className="flex items-center gap-1.5">
                   <span className="typography-ui-label text-foreground">{t('settings.agents.page.field.temperature')}</span>
-                  <Tooltip delayDuration={1000}>
+                  <Tooltip>
                     <TooltipTrigger asChild>
                       <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
                     </TooltipTrigger>
@@ -822,7 +822,7 @@ export const AgentsPage: React.FC = () => {
               <div className={cn("flex min-w-0 flex-col", isMobile ? "w-full" : "sm:w-56 shrink-0")}>
                 <div className="flex items-center gap-1.5">
                   <span className="typography-ui-label text-foreground">{t('settings.agents.page.field.topP')}</span>
-                  <Tooltip delayDuration={1000}>
+                  <Tooltip>
                     <TooltipTrigger asChild>
                       <RiInformationLine className="h-3.5 w-3.5 text-muted-foreground/60 cursor-help" />
                     </TooltipTrigger>