Fix mine inbox keyboard selection

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/lib/inbox.test.ts

@@ -11,6 +11,7 @@ import {
   isMineInboxTab,
   loadLastInboxTab,
   RECENT_ISSUES_LIMIT,
+  resolveInboxSelectionIndex,
   saveLastInboxTab,
   shouldShowInboxSection,
 } from "./inbox";
@@ -408,4 +409,11 @@ describe("inbox helpers", () => {
     expect(isMineInboxTab("unread")).toBe(false);
     expect(isMineInboxTab("all")).toBe(false);
   });
+
+  it("anchors Mine selection to the first available inbox row", () => {
+    expect(resolveInboxSelectionIndex(-1, 3, true)).toBe(0);
+    expect(resolveInboxSelectionIndex(-1, 3, false)).toBe(-1);
+    expect(resolveInboxSelectionIndex(5, 3, true)).toBe(2);
+    expect(resolveInboxSelectionIndex(1, 0, true)).toBe(-1);
+  });
 });

ui/src/lib/inbox.ts

@@ -102,6 +102,16 @@ export function isMineInboxTab(tab: InboxTab): boolean {
   return tab === "mine";
 }
 
+export function resolveInboxSelectionIndex(
+  previousIndex: number,
+  itemCount: number,
+  canSelectItems: boolean,
+): number {
+  if (itemCount === 0) return -1;
+  if (previousIndex < 0) return canSelectItems ? 0 : -1;
+  return Math.min(previousIndex, itemCount - 1);
+}
+
 export function getLatestFailedRunsByAgent(runs: HeartbeatRun[]): HeartbeatRun[] {
   const sorted = [...runs].sort(
     (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime(),