Address Copilot review feedback

- Fall back to selecting all runs when no previously selected run still
  exists, so deletions don't leave an empty selection.
- Add aria-label to the Runs filter input for screen readers.
- Add regression test for the empty-intersection fallback.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: abidlabs

trackio/frontend/src/lib/selection.js

@@ -9,7 +9,7 @@ export function reconcileSelectedRuns(prevSelected, newOrderedIds) {
   const newIdSet = new Set(ordered);
   const kept = prev.filter((r) => newIdSet.has(r));
 
-  if (prev.length === 0) {
+  if (prev.length === 0 || kept.length === 0) {
     return [...ordered];
   }
 

trackio/frontend/src/lib/selection.test.js

@@ -36,4 +36,13 @@ describe("reconcileSelectedRuns", () => {
   test("drops runs that no longer exist on the server", () => {
     expect(reconcileSelectedRuns(["a", "b", "c"], ["a", "c"])).toEqual(["a", "c"]);
   });
+
+  test("falls back to all runs when none of the previously selected runs exist anymore", () => {
+    expect(reconcileSelectedRuns(["a"], ["b"])).toEqual(["b"]);
+    expect(reconcileSelectedRuns(["x", "y"], ["a", "b", "c"])).toEqual([
+      "a",
+      "b",
+      "c",
+    ]);
+  });
 });

trackio/frontend/src/pages/Runs.svelte

@@ -121,6 +121,7 @@
       <input
         type="text"
         class="filter-input"
+        aria-label="Filter runs"
         placeholder="Filter runs..."
         bind:value={filterText}
       />