feat: full password editing with cursor navigation

- Add arrow key support (Left/Right/Home/End) for cursor movement
- Add Delete key to remove character at cursor position
- Render cursor between password dots with visual indicator
- Modularize render.rs into separate modules (indicator, media_bar, status_bar, feedback)
- Add cubic ease-in-out for fade-in animation
- Optimize media_rects to use &'static str instead of String allocations

src/util.rs

@@ -72,10 +72,7 @@ where
     }
 }
 
-pub fn serialize_blur_effect<S>(
-    val: &Option<(u32, u32)>,
-    serializer: S,
-) -> Result<S::Ok, S::Error>
+pub fn serialize_blur_effect<S>(val: &Option<(u32, u32)>, serializer: S) -> Result<S::Ok, S::Error>
 where
     S: Serializer,
 {