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_16.txt

@@ -0,0 +1,17 @@
+                                      
+                edcccccxe             
+               oexxcxxexde            
+              xooceodexx ce           
+             ooo dceexexxccx          
+             xxdeoccdxxcoxee          
+            xxxcxc xed  x xox         
+            eex oeoxxxxocco x         
+            xod xexxoxxxcd ex         
+            eexxxcxoexxccc  o         
+            cceeoddecxoex oex         
+            xxxcccocexdcdoxxe         
+             xxc xe  eooo  o          
+             exc  x  oooeox           
+              exxcecxoocex            
+               cdoeddeedc             
+