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_2.txt

@@ -0,0 +1,17 @@
+                                      
+             eoeddcdddcoe             
+         ecoocdcxxxdxxdecxcce         
+       oxcxeccxcee  eccdcoxxdxo       
+     exoeoccooe           ooexoxo     
+     oecocexeeeee           eoxexo    
+    cocce  xcecoec           eexcx    
+   oxccx    eoxdxexo          ocxcx   
+   xc ee     oxcxxdc          xcoox   
+   cccdx    dxeeexcoxccccccccoxexxc   
+    edcx  oxxc oc xdeeeeeooeexco x    
+    eee c ceooxc   ecccccccccxocxx    
+     ceeooo e              ocdooc     
+       oeeexco          odec exc      
+        exedeecccdddddodceexxc        
+           eccccxxeeeexdocc           
+