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_25.txt

@@ -0,0 +1,17 @@
+                                      
+             apnonppppa               
+           p opoaannioiip             
+          eieeppoeipnnniiia           
+         ipoi e  ni onipone           
+        paanpeoaneaio ieeneo          
+        npiiiaopeaie eipieeip         
+        ieioi iaaenaeineaoini         
+        iiieieo ianneinainiin         
+       apnioiaannnnpiinnipoin         
+        epoieipiaiinoainoneni         
+        nioeniaoooooopeinieia         
+         iaoinpnnppoeaepeeie          
+          aaaianaonepaeaiie           
+           nennnaonioo oio            
+             ipoonppapio              
+