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_12.txt

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