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_12.txt

@@ -0,0 +1,17 @@
+                                      
+                pooope                
+               pnaaeipn               
+               o  ienpp               
+               epiiinnoi              
+              i oiiiieei              
+              ioeeoaoaio              
+              i   ieniin              
+              i   epniio              
+              op ieiipii              
+              i   eionoa              
+              ie  ionooe              
+               p  oi api              
+               e ooiponi              
+               oaeopinia              
+                n oinee               
+