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_3.txt

@@ -0,0 +1,17 @@
+                                      
+             aennppnnnnpa             
+         appeniipionninaaiopa         
+       pneonioooa   aoi oopeaip       
+      epeninppa          ano iin      
+     oeoieaeiiona           naniia    
+    einne  epinnnn           i nni    
+    no i    ooniaoip          eoeip   
+   ppipi     ppioeni          iaini   
+    pooi    niopiiopinppaaappaiaoni   
+    pnenp eeoenni ioiaap nepnnainia   
+    oai i oiippo   ooooooooopeeepe    
+     ooi np a              eapaee     
+       naeeonp          ppneopio      
+         nappaooannnnpenonaapo        
+           aopoaeiaaaaineao           
+