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/codex/frame_4.txt

@@ -0,0 +1,17 @@
+                                      
+             eoddcddcdcoe             
+         eocccxo xedocdxcocoe         
+       ocdxxxccce   eexeecxoeee       
+      ooxoxcoco          cxccece      
+     oxoexdxedexo          ecexce     
+    oxxex  cexxoce          c edxo    
+    cexde   ccceccxo         o cdx    
+     xoe     oxocexx           xxx    
+    ex xe   dxoceoocxccceeeeoo xxc    
+    xeo x oooooexedexooeodoedxoocx    
+     exdceoeeoeo   ccccccccceoxxxe    
+      oxecxee             oedoccc     
+       eeode oe        eoeocdxo       
+         xxxdecceddddocdccexce        
+            ceexdxeeeeedoce           
+