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_6.txt

@@ -0,0 +1,17 @@
+                                      
+             eodddcddccee             
+          oedocxdccxccdeocce          
+        oooxxxcc   ecxodcccoee        
+       ooxcxcedo        ecxxxxo       
+      cdxxxceecce         oeexeo      
+     dooxoeecdxeexo        odeox      
+     e cxx    eexoee        ecxex     
+     x xxx   exdxoxx        xcexx     
+     eoxox  ocxxcdocexcxeecceoeox     
+     xxeooeeedc xodcoxxodddexoxe      
+      o x oxxxdoc  cccccccceeeox      
+       o d ooe           odeooxe      
+        oeeecco       eceeococ        
+         ecxcocc dxeeoccc ddc         
+            eodccoeeeeeocc            
+