feat: tune session sidebar tooltip timing

Adds a shared sidebar tooltip provider with delayed open and instant close behavior
Removes per-button tooltip delays so sidebar actions feel more consistent
Aligns session sidebar hover interactions with the opencode-style tooltip experience

packages/ui/src/components/session/SessionSidebar.tsx

@@ -592,13 +592,12 @@ const SessionSidebarComponent: React.FC<SessionSidebarProps> = ({
   }, [mobileVariant, openNewSessionDraft, setSessionSwitcherOpen]);
 
   return (
-    // One shared tooltip provider for the whole sidebar: session tooltips open
-    // instantly, and moving between rows hands the tooltip over (grouping)
-    // instead of replaying the exit/enter animation for each row.
-    // closeDelay bridges the small gap between rows: the tooltip survives the
-    // pointer crossing row margins, and the grouping timeout hands it over to
-    // the next row without an exit/enter cycle.
-    <TooltipProvider delay={0} closeDelay={150} timeout={600}>
+    // One shared tooltip provider for the whole sidebar, matching the opencode
+    // sidebar feel: 400ms before the first tooltip opens, instant close on
+    // leave, and grouping — moving between rows within 600ms hands the tooltip
+    // over to the next row without replaying the open delay or exit/enter
+    // animation.
+    <TooltipProvider delay={400} closeDelay={0} timeout={300}>
     <div
       ref={sessionSearchContainerRef}
       className={cn(