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_1.txt

@@ -0,0 +1,17 @@
+                                      
+             aeaenppnnppa             
+         anpeonpepnniina aopa         
+       pioipoooaa   aooaoiniiip       
+      noanooppa            eoinip     
+     naneoainann            oeinnp    
+    io pa  ioeniip           oeniip   
+   paopo    onioeoia            iei   
+   iiaia     peeinio            oai   
+   inioa    niianioeippppppapp no i   
+    aino  anpa eo ioiaaaeepppiepepi   
+    naaoa anpeea   aaoooo aooepnae    
+     oap op a              poeoai     
+       anpanpa          anapiapo      
+         aopna opennnnenopapio        
+           aoooiiiaaapanpoo           
+