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_4.txt

@@ -0,0 +1,17 @@
+                                      
+             aennpnnpnppa             
+         apopoie inneonioeopa         
+       poniiipooa   aainaoienna       
+      eeipioepp          oioonon      
+     eieaininnaip          nonion     
+    eiiai  oaiieon          o nnip    
+    onina   ooonpoip         p oni    
+     ien     pieoaii           iii    
+    ai ia   nieoaeepipppaaaapp iio    
+    ine i peeepaiannipeapeeanieeoi    
+     ainonpnnpne   oooooooooapiiia    
+      pinoiaa             paneooo     
+       nnpea pa        aeaponie       
+         iiinaoonnnnnppnopnioa        
+            onnieiaaaaanpoa           
+