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_21.txt

@@ -0,0 +1,17 @@
+                                      
+             aapnpnnpnppaa            
+          ppoaaaapinipnaapopa         
+        noaapoaoa     aaiopaaop       
+      poinoo             apnopnop     
+     epeoa             piean nnaap    
+    eoei             pooaee    nnap   
+    ioia           a eapeo     nnno   
+     an            nn oip       i i   
+    i i  ppnnnnnppp  aipoip    ne i   
+    i in ia      api   aoaoip  eoee   
+     n oe aaooo  oa     ooapn ea p    
+     op ena                 aoo e     
+       oa  apa          aenoo pa      
+         ona ooopeiinenooo  pa        
+            oppnpaaaapanpoa           
+