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_31.txt

@@ -0,0 +1,17 @@
+                                      
+                aeeopopnp             
+              aponppaopnoop           
+             pineepnaaeoiaon          
+            piepaaonapnniniin         
+            aiiiipponaponieaa         
+           niaaiaioonnopeeipoi        
+           eii iaoinenenoioiei        
+           nnp iioin iaooiinei        
+           inpaioaiiiepiiia  i        
+           oiiieeiiaaanainii o        
+           aoaepip eoooaeioia         
+            iiinnnp     ano i         
+             niona p  e ioaea         
+              einieaiapiopia          
+               ooniapoeeno            
+                   aaaa