feat: show pin icon on home session's pinned tabs too

TabBar's pin icon now shows for both virtual pinned tabs (injected
from other sessions) AND the home session's own pinned terminal tabs
(those with tab.pin !== undefined). Previously only virtual tabs got
the icon — the home tab looked like a regular terminal despite being
pinned.

src/client/TabBar.tsx

@@ -184,7 +184,7 @@ export function TabBar(props: {
     >
       <div ref={listRef} className={css.tabList}>
         {tabs.map(tab => {
-          const pinned = isPinnedVirtualTab(tab)
+          const pinned = isPinnedVirtualTab(tab) || tab.pin !== undefined
           return (
           <div
             key={tab.id}