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_22.txt

@@ -0,0 +1,17 @@
+                                      
+             appnpnnpnppa             
+         apeoieaeieniinipeopa         
+       pnoninooa    aoonoopaapp       
+      noiooo            ppiiiaon      
+     niieo            paeinieenoi     
+    nioea           pieinaea ninni    
+   ipone           ipinoeo    iiei    
+   iinia           iniian     iaioi   
+   iipop pinnnnnnppanoia np   aino    
+   ain oannp epoieei  nonaoipp enn    
+    nnnai ooooooooa    aeopaeeeopa    
+     nonanp               aopoipo     
+      oopn ppa         aeopooae       
+        oeoppooinnpnnenoooopo         
+           oioianaaapnaenoa           
+