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_20.txt

@@ -0,0 +1,17 @@
+                                      
+              eecdxxdcdoee            
+          oddcdoeodddxxeececo         
+        oocecccxcc    ecececcxce      
+      excecxc           eocxeocee     
+     ex oxc           eo exxecexxe    
+     oeoxc           cccdxco  cexxe   
+    dxdcx          oc occe     oexo   
+    xeeoe          ccddxco     xxcx   
+    xoxxdoddddddddeocdeeeec    o xe   
+    cxexec oeeeeeexe  ceecxde oo xx   
+     eoeecccccccccc     eodxxox oe    
+      c ecoo               eocoxo     
+        eeecoxe          odcedcc      
+          eooocxceddodcxceoocc        
+            eccxe deeeexccc           
+