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/slug/frame_17.txt

@@ -0,0 +1,17 @@
+                                      
+                totttccxtd            
+             dcppexxpopetgdt          
+            tpo5dooettgeeedgo         
+           5e5d5egde pecoxeeoo        
+           e5d x    eg5ooo55  t       
+          eopt5e   tc5e 5to5e-5       
+          pgc5e   t55ed pgee5oe       
+          -goeg   g55ee5eteeocp       
+          t5p5oootxodeodcoeee e       
+           egdcdde5po5eeogotpto       
+          ooo5gggppppodep55o op       
+           oeedp       e5eee c        
+            doogpod   tpt5dd5         
+             t xptootedcpcep          
+              etc5dttxpdtp            
+                   e