feat: work-in-progress limits and swimlanes on the board

Each status can carry a WIP limit in the project settings; the board shows
it next to the count, marks a column that goes over it and says so when a
card is dropped there. The board can also be grouped in rows by person,
epic, priority or type, remembered per browser.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/web/tracker/presenters/src/lib/pages/board.page.scss

@@ -136,3 +136,49 @@
   font-weight: 400;
   color: var(--ts-muted);
 }
+
+.ts-column.is-over {
+  box-shadow: inset 0 3px 0 var(--ts-c-red, var(--ts-ink));
+
+  .ts-column__count {
+    color: var(--ts-c-red, var(--ts-ink));
+    font-weight: 700;
+  }
+}
+
+/* Grouped board: heads and rows scroll together. */
+.ts-lanes {
+  overflow-x: auto;
+  padding-bottom: 0.75rem;
+
+  .ts-board {
+    overflow: visible;
+    padding-bottom: 0;
+  }
+}
+
+.ts-board--heads {
+  margin-bottom: 0.5rem;
+
+  .ts-column--head {
+    min-height: 0;
+  }
+}
+
+.ts-lane {
+  margin-bottom: 1rem;
+}
+
+.ts-lane__title {
+  position: sticky;
+  left: 0;
+  display: inline-flex;
+  align-items: baseline;
+  gap: 0.5rem;
+  margin: 0 0 0.5rem;
+  font-size: 0.875rem;
+}
+
+.ts-column--lane .ts-column__list {
+  min-height: 3.5rem;
+}