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_8.txt

@@ -0,0 +1,17 @@
+                                      
+             eecedccdcoe              
+           occoxxxcdd x cc            
+         exdoxooc ocxoxceceo          
+        ececoxocx     c dexxe         
+        c oxooexoe      ocexxo        
+       xcoxeeeeexec      ecxxx        
+       xcxxx cedexex     xexoxo       
+       eoxxo  xceoxoco    oeoxx       
+       e exxee  ocdxxococooexxx       
+          ecodexcoxoxxdxdeexxdc       
+        ooeexexxxocececceccoex        
+        cocxexee        oooooc        
+         ceeceeee    eoeexcoc         
+           odcxoc ddccdodoxe          
+             xxeccexeocode            
+                  ee