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_19.txt

@@ -0,0 +1,17 @@
+                                      
+              aannpipnniea            
+           apiiinennnaoapiopp         
+         ponneoipoa    aoepaonn       
+        eniopaa         annppaiop     
+       iieaea         piaoeoin inp    
+      ineoo         aioie ee oeoi     
+      aniio        eoaeippa   eeepi   
+      iiii         inoniop    i iii   
+      ioinpnnnnnniiiiponoin   n oii   
+      anepinoeaopnpap aa enanpeeia    
+      onoepioooooooo   anaeiee eeo    
+       nnaoan             aeeaeeo     
+        o aniiop        pnneeina      
+          ooeioeipaanneoo noio        
+             oieaepoapeaopa           
+