refactor(ui): use iterator in TileBar loop

Update the loop in TileBar to use an iterator-based approach with
enumerate, take, and skip instead of indexing.

Co-Authored-By: fiddlerwoaroof/git-smart-commit (gemma-4-31B-it-UD-Q4_K_XL.gguf)

src/ui/tile_bar.rs

@@ -80,11 +80,11 @@ impl<'a> Widget for TileBar<'a> {
             // Check if selected tile is visible when starting from `start`
             let mut used: u16 = 0;
             let mut sel_visible = false;
-            for i in start..labels.len() {
+            for (i, w) in widths.iter().enumerate().take(labels.len()).skip(start) {
-                if used + widths[i] > avail {
+                if used + *w > avail {
                     break;
                 }
-                used += widths[i];
+                used += *w;
                 if i == sel {
                     sel_visible = true;
                 }