Change animation frames (#3627)

## Description
- Changes animation frames to be smaller
- Cleans up file names and popup logic

## tests
- Passes local CI

codex-rs/tui/frames/openai/frame_20.txt

@@ -0,0 +1,17 @@
+                                      
+              aapniinpnpaa            
+          pnnonpapnnniiaaonpp         
+        ppoapooioo    aoaonpoipa      
+      aioaoio           appineonn     
+     ai pio           ae aiiaoniin    
+     eapio           poonioe  oniin   
+    ninpi          po epoa     pnie   
+    iaaea          ooneiop     iioi   
+    ieiinpnnnnnnnnaponaanno    e in   
+    oiaiao eaaaaaain  onnoinn pe ii   
+     npanoooooooooo     npniipi en    
+      o aoep               aeoeie     
+        naaopia          pnoanoo      
+          appeoipannpeoioapeoo        
+            aopia naaaaiooo           
+