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_30.txt

@@ -0,0 +1,17 @@
+                                      
+                 anooopp              
+               aeniinoonn             
+               ooaipnnippn            
+              iinieianin np           
+              noiianipip  i           
+             ioiap  oiiiiei           
+             neiiina neni na          
+             oi opnipioip  a          
+             oiaoninineip  a          
+             oiiniaaii pp  a          
+              niinnaoiiipii           
+              ioeepeoniio i           
+              niniieoiipie            
+               pappnaeipeo            
+                npeiaaano             
+                  aaaa