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/git/GitHeader.tsx

@@ -104,7 +104,6 @@ interface IdentityDropdownProps {
   identities: GitIdentityProfile[];
   onSelect: (profile: GitIdentityProfile) => void;
   isApplying: boolean;
-  tooltipDelayMs?: number;
   iconOnly?: boolean;
 }
 
@@ -113,7 +112,6 @@ const IdentityDropdown: React.FC<IdentityDropdownProps> = ({
   identities,
   onSelect,
   isApplying,
-  tooltipDelayMs = 1000,
   iconOnly = false,
 }) => {
   const { t } = useI18n();
@@ -121,7 +119,7 @@ const IdentityDropdown: React.FC<IdentityDropdownProps> = ({
 
   return (
     <DropdownMenu>
-      <Tooltip delayDuration={tooltipDelayMs}>
+      <Tooltip>
         <TooltipTrigger asChild>
           <DropdownMenuTrigger asChild>
             <Button
@@ -224,7 +222,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
   const managementButtons = (
     <div className="flex items-center gap-1 shrink-0">
       {onOpenHistory ? (
-        <Tooltip delayDuration={useTwoRowHeader ? 300 : 1000}>
+        <Tooltip>
           <TooltipTrigger asChild>
             <Button
               variant="ghost"
@@ -252,7 +250,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
       removingRemoteName={removingRemoteName}
       disabled={!status}
       iconOnly={true}
-      tooltipDelayMs={useTwoRowHeader ? 300 : 1000}
+
       aheadCount={status.ahead}
       behindCount={status.behind}
     />
@@ -264,7 +262,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
       identities={availableIdentities}
       onSelect={onSelectIdentity}
       isApplying={isApplyingIdentity}
-      tooltipDelayMs={useTwoRowHeader ? 300 : 1000}
+
       iconOnly={false}
     />
   );
@@ -287,7 +285,7 @@ export const GitHeader: React.FC<GitHeaderProps> = ({
               onCheckout={onCheckoutBranch}
               onCreate={onCreateBranch}
               remotes={remotes}
-              tooltipDelayMs={useTwoRowHeader ? 300 : 1000}
+
             />
           )}
         </div>