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_5.txt

@@ -0,0 +1,17 @@
+                                      
+             eodddcdddcoe             
+         ecccocoxxcxdcdexcco          
+        ceoecxcce   cedxce oco        
+      oxoxoxodo          oexxxxe      
+     oeocoeecxeeo         e exexe     
+     xxxxo eexedoxe          coxx     
+    xox c   eeexecxo        ccxcxo    
+    xoxec    oedxoex          cxex    
+    xoxec   oexcoxcdexcxeeecoecxox    
+     eexeoooccc xc ooedeodoooxocxe    
+     eoxxoxoeeoce  ccccccccoxdxeo     
+      eecoee e            oeocoe      
+       eocexdce        edcoccdc       
+         excxoccedxdeocdcexdc         
+            eocecceeeoeocce           
+