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_1.txt

@@ -0,0 +1,17 @@
+                                      
+             eoeddccddcoe             
+         edoocecocedxxde ecce         
+       oxcxccccee   eccecxdxxxc       
+      dceeccooe            ocxdxo     
+     eedocexeeee            coxeeo    
+    xc ce  xcodxxo           coexxo   
+   cecoc    cexcocxe            xox   
+   xxexe     oooxdxc            cex   
+   xdxce    dxxeexcoxcccccceco dc x   
+    exdc  edce oc xcxeeeodoooxoooox   
+    eeece eeoooe   eecccc eccoodeo    
+     ceo co e              ococex     
+       eeoeece          edecxecc      
+         ecoee ccdddddodcceoxc        
+           ecccxxxeeeoedccc           
+