Tiles view: +/- control for cards per row

Adjusts the tile grid's column count as an offset from the existing
width-based auto-fill default, shared across Library, Decks, Card search,
and set card lists. Clicking the count resets to the default.

src/styles.css

@@ -2304,6 +2304,11 @@ tbody tr:hover {
 .tile-rotated {
   grid-column: span 2;
 }
+/* …except when the per-row control is down to one column, where a span of 2
+   would add an implicit second column and overflow. */
+.tile-grid-single .tile-rotated {
+  grid-column: auto;
+}
 .tile-img-wrap {
   position: relative;
 }
@@ -2447,6 +2452,11 @@ tbody tr:hover {
   gap: 4px;
   align-items: center;
 }
+/* Inputs keep an intrinsic ~160px width that would overflow tiles narrowed
+   by the per-row control; let them shrink with the tile instead. */
+.tile-footer input {
+  min-width: 0;
+}
 
 /* ============================================================
    Toolbar controls: group-by + view toggle
@@ -2491,6 +2501,25 @@ tbody tr:hover {
   background: var(--accent);
   color: #fff;
 }
+.view-toggle button:disabled {
+  background: transparent;
+  opacity: 0.4;
+  cursor: default;
+}
+/* Tiles-per-row stepper (see `TileColumnsControl`): same segmented look as
+   the List/Tiles toggle, with a fixed-width count between − and +. */
+.tile-columns button {
+  padding: 5px 9px;
+  font-variant-numeric: tabular-nums;
+}
+.tile-columns .tile-columns-count {
+  min-width: 2.2em;
+  padding-left: 4px;
+  padding-right: 4px;
+}
+.tile-columns .tile-columns-count:disabled {
+  opacity: 1;
+}
 
 /* ============================================================
    Deck metadata (format + commander)