Fix: Auto-scroll to bottom when selecting session from list (#3988)

Co-authored-by: shanjairaj7 <shanjairaj7@users.noreply.github.com>
Co-authored-by: Aiden Cline <aidenpcline@gmail.com>

packages/opencode/src/cli/cmd/tui/routes/session/index.tsx

@@ -5,6 +5,7 @@ import {
   createSignal,
   For,
   Match,
+  on,
   Show,
   Switch,
   useContext,
@@ -162,6 +163,9 @@ export function Session() {
     return session()?.revert?.messageID
   })
 
+  // snap to bottom when session changes
+  createEffect(on(() => route.sessionID, toBottom))
+
   const local = useLocal()
 
   function moveChild(direction: number) {