/status followup (#4304)

- Render `send a message to load usage data` in the beginning of the
session
- Render `data not available yet` if received no rate limits 
- nit case
- Deleted stall snapshots that were moved to
`codex-rs/tui/src/status/snapshots`

codex-rs/core/src/client.rs

@@ -559,10 +559,6 @@ fn parse_rate_limit_snapshot(headers: &HeaderMap) -> Option<RateLimitSnapshot> {
         "x-codex-secondary-reset-after-seconds",
     );
 
-    if primary.is_none() && secondary.is_none() {
-        return None;
-    }
-
     Some(RateLimitSnapshot { primary, secondary })
 }