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_18.txt

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