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/openai/frame_33.txt

@@ -0,0 +1,17 @@
+                                      
+               appnpnpniea            
+            apoiinonieipioioe         
+          aenipoppnoa  ooeiipop       
+         pneieaipa        oiinao      
+        aeieaiienan         ipnna     
+        eep   nannanp        enean    
+        iip    npoiain       ioii     
+        oipp   poonenp       noio     
+        iii i pa eopppnnnpiipeaini    
+        aeiooeepeaiiaaaaaiioaaaiie    
+        nnnp ieie e ooooooo iipeaa    
+         npnopop           eenene     
+          onooponp      apipeono      
+            nioonpipnpaonpnoio        
+              onnppaaaaponpo          
+                   aaaa