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_36.txt

@@ -0,0 +1,17 @@
+                                      
+              aapnppppnppa            
+          anoonpenepnpnppooopa        
+        pnonppopooaa aooiopipoip      
+      aioopaaaa            ooinoi     
+     peannoinanpe             aneo    
+     e pea  oa oiep            onao   
+    i n a      n onn            iaip  
+    iini      an aee            ni i  
+    iooi     ee pooopppapppppa  inii  
+     aoin  piaaeie  aiaaaaaaaii neoa  
+     o oin papea     oooaaaaao ipoe   
+      oponne                 peioe    
+        neiipip           pppoepa     
+          opaooonaniapinopopnpo       
+            aopeiappappppooo          
+