Add Reset in for rate limits (#4111)

- Parse the headers
- Reorganize the struct because it's getting too long
- show the resets at in the tui

<img width="324" height="79" alt="image"
src="https://github.com/user-attachments/assets/ca15cd48-f112-4556-91ab-1e3a9bc4683d"
/>

codex-rs/core/src/error.rs

@@ -267,14 +267,20 @@ pub fn get_error_message_ui(e: &CodexErr) -> String {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use codex_protocol::protocol::RateLimitWindow;
 
     fn rate_limit_snapshot() -> RateLimitSnapshot {
         RateLimitSnapshot {
-            primary_used_percent: 0.5,
-            secondary_used_percent: 0.3,
-            primary_to_secondary_ratio_percent: 0.7,
-            primary_window_minutes: 60,
-            secondary_window_minutes: 120,
+            primary: Some(RateLimitWindow {
+                used_percent: 50.0,
+                window_minutes: Some(60),
+                resets_in_seconds: Some(3600),
+            }),
+            secondary: Some(RateLimitWindow {
+                used_percent: 30.0,
+                window_minutes: Some(120),
+                resets_in_seconds: Some(7200),
+            }),
         }
     }