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_24.txt

@@ -0,0 +1,17 @@
+                                      
+             aianpponnpa              
+          poaeoiaainnppaop            
+        poonnepoi eaeoioop n          
+       poeepeinpnaiea aoninao         
+      p eenep    aooenaiaanipo        
+      ipnpna       oppe ein eon       
+     i  ii       peapeoeaninaia       
+     i nii       ipnenaiiaeeaii       
+     ie innneppiiippaopai i  ii       
+      a e  oieppnnppieanpoi ioi       
+      n oninoooooooa npeoninepa       
+       n npon           i oene        
+        neonaie      anoaeeao         
+          epopnaoiiennniaaea          
+            oeaopnnaannpo             
+