fix(sessions): keep created-session scope through navigation and send (#10)

createSession now stamps the scope directory onto the returned session, and the
create-session navigation passes that directory to the detail screen. Previously
a freshly created home-scoped session was opened/addressed with the default
(CWD) client because the route carried no directory param — the same scope
mismatch class as #10, on the open/send path instead of the list path.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/(tabs)/index.tsx

@@ -188,7 +188,10 @@ export default function SessionsScreen() {
   const onCreateSession = async () => {
     const session = await createSession()
     if (session) {
-      router.push(`/session/${session.id}`)
+      router.push({
+        pathname: `/session/[id]`,
+        params: { id: session.id, ...(session.directory ? { directory: session.directory } : {}) },
+      })
     }
   }
 
@@ -227,7 +230,10 @@ export default function SessionsScreen() {
     setShowNewSession(false)
     setCustomDir("")
     if (session) {
-      router.push(`/session/${session.id}`)
+      router.push({
+        pathname: `/session/[id]`,
+        params: { id: session.id, ...(session.directory ? { directory: session.directory } : {}) },
+      })
     }
   }