Apply PR #15282: show scrollbar by default

Author: opencode-agent[bot]

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

@@ -154,7 +154,7 @@ export function Session() {
   const [timestamps, setTimestamps] = kv.signal<"hide" | "show">("timestamps", "hide")
   const [showDetails, setShowDetails] = kv.signal("tool_details_visibility", true)
   const [showAssistantMetadata, setShowAssistantMetadata] = kv.signal("assistant_metadata_visibility", true)
-  const [showScrollbar, setShowScrollbar] = kv.signal("scrollbar_visible", false)
+  const [showScrollbar, setShowScrollbar] = kv.signal("scrollbar_visible", true)
   const [showHeader, setShowHeader] = kv.signal("header_visible", true)
   const [diffWrapMode] = kv.signal<"word" | "none">("diff_wrap_mode", "word")
   const [animationsEnabled, setAnimationsEnabled] = kv.signal("animations_enabled", true)