Add multiselect board filters and letter-jump on picker menus.

Persist comma-separated list filters per project, toggle with space, and jump by first letter in board and project pickers.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ticket/board_test.go

@@ -41,3 +41,38 @@ func TestBoardListDefaultStatus(t *testing.T) {
 		t.Fatal("all default")
 	}
 }
+
+func TestBoardFilterMultiSelect(t *testing.T) {
+	f := ticket.ParseBoardLists("backlog,done")
+	if !f.Matches(ticket.StatusTodo) || !f.Matches(ticket.StatusDone) {
+		t.Fatalf("expected backlog+done match, got %v", f)
+	}
+	if f.Matches(ticket.StatusInProgress) {
+		t.Fatal("should not match in progress")
+	}
+	if got := ticket.FormatBoardLists(f); got != "backlog,done" {
+		t.Fatalf("format = %q", got)
+	}
+}
+
+func TestBoardFilterAllDominatesNormalize(t *testing.T) {
+	f := ticket.NormalizeFilter(ticket.BoardFilter{ticket.BoardAll, ticket.BoardBacklog})
+	if len(f) != 1 || f[0] != ticket.BoardBacklog {
+		t.Fatalf("got %v", f)
+	}
+}
+
+func TestBoardListShortcut(t *testing.T) {
+	if ticket.BoardAll.Shortcut() != 'a' {
+		t.Fatal("all")
+	}
+	if ticket.BoardBacklog.Shortcut() != 'b' {
+		t.Fatal("backlog")
+	}
+	if ticket.BoardInProgress.Shortcut() != 'i' {
+		t.Fatal("in progress")
+	}
+	if ticket.BoardDone.Shortcut() != 'd' {
+		t.Fatal("done")
+	}
+}