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/dots/frame_20.txt

@@ -0,0 +1,17 @@
+                                      
+              ○○●○··○●○●○○            
+          ●◉○ ◉●○●○○○··○○●○●●         
+        ●● ○●● ·●     · ○ ○●●·●○      
+      ○· ○●·●           ○●●·○◉●○○     
+     ○· ●·●           ○◉ ○··○●○··○    
+     ◉·●·●           ●●●◉· ◉  ●○··○   
+    ◉·◉●·          ●● ◉●●○     ●○·◉   
+    ·○○◉·            ◉◉· ●     ·· ·   
+    ·◉··◉●○◉○○○○○○○●●◉○○○○●    ◉ ·○   
+    ●·○·○  ◉··○○○○·○  ●○○ ·○○ ●◉ ··   
+     ○●○○●       ●      ○●○··●· ◉○    
+      ● ○●◉●               ○◉●◉·◉     
+        ○○○●●·○          ●◉●·◉●●      
+          ○●◉◉ ·●○◉◉●◉ · ·●◉●●        
+            ·●●·○ ○○○○○·●             
+