style: reformat code and cleanup whitespace

Reformat code for improved readability and remove unnecessary whitespace.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-26B-A4B-it-UD-Q5_K_XL.gguf)

src/ui/grid.rs

@@ -915,7 +915,10 @@ mod tests {
     fn formula_cell_renders_computed_value() {
         let mut m = Workbook::new("Test");
         m.add_category("Region").unwrap(); // → Column
-        m.model.category_mut("_Measure").unwrap().add_item("Revenue");
+        m.model
+            .category_mut("_Measure")
+            .unwrap()
+            .add_item("Revenue");
         m.model.category_mut("_Measure").unwrap().add_item("Cost");
         // Profit is a formula target — dynamically included in _Measure
         m.model.category_mut("Region").unwrap().add_item("East");
@@ -927,7 +930,8 @@ mod tests {
             coord(&[("_Measure", "Cost"), ("Region", "East")]),
             CellValue::Number(600.0),
         );
-        m.model.add_formula(parse_formula("Profit = Revenue - Cost", "_Measure").unwrap());
+        m.model
+            .add_formula(parse_formula("Profit = Revenue - Cost", "_Measure").unwrap());
         m.active_view_mut()
             .set_axis("_Index", crate::view::Axis::None);
         m.active_view_mut()

src/ui/tile_bar.rs

@@ -18,12 +18,7 @@ pub struct TileBar<'a> {
 }
 
 impl<'a> TileBar<'a> {
-    pub fn new(
-        model: &'a Model,
-        view: &'a View,
-        mode: &'a AppMode,
-        tile_cat_idx: usize,
-    ) -> Self {
+    pub fn new(model: &'a Model, view: &'a View, mode: &'a AppMode, tile_cat_idx: usize) -> Self {
         Self {
             model,
             view,